Journal articles: 'Elemental geochemistry'

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Hanson, B. "GEOCHEMISTRY: Elemental Traces." Science 307, no. 5713 (February 25, 2005): 1171d. http://dx.doi.org/10.1126/science.307.5713.1171d.

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Bounakhla, M., K. Embarch, F. Zahry, E. Bilal, and P. Kump. "Capabilities of elemental analysis by EDXRF for geochemistry." Journal of Radioanalytical and Nuclear Chemistry 275, no. 3 (October 13, 2007): 467–78. http://dx.doi.org/10.1007/s10967-005-6698-7.

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Kiage, Lawrence M., Meghan Howey, Joel Hartter, and Michael Palace. "A late Holocene record of human impacts on tropical environments from non-pollen palynomorphs, Albertine Rift, western Uganda." Quaternary Research 93 (October 22, 2019): 172–86. http://dx.doi.org/10.1017/qua.2019.53.

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AbstractNon-pollen palynomorphs and elemental geochemistry data from Lake Kifuruka in western Uganda provide evidence of environmental change in the tropical African region since the beginning of the Holocene. The multi-proxy record presented here shows that dry conditions dominated the end of the Pleistocene evidenced by calcium enriched sediments and suppressed fungal taxa activity. Moist conditions dominated the early Holocene and persisted until just after 1960 cal yr BP. Elevated frequencies of individual fungal spore taxa associated with herbivory and soil erosion, including Sordaria-type, Sporormiella-type, Chaetomium-type, and Glomus-type, about 4300 cal yr BP suggests a significant environmental change that could be linked to human activities. A convergence of multiple proxy data, including microscopic charcoal, elemental geochemistry, and fungal spores, strongly support the occurrence of anthropogenic forest disturbance in the Albertine Rift about 4300 cal yr BP.

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Riley, David A., Tim J. Pearce, Eliza Mathia, Ken Ratcliffe, and John Martin. "The application of elemental geochemistry to UK onshore unconventional plays." Geological Society, London, Petroleum Geology Conference series 8, no. 1 (September 26, 2016): 585–94. http://dx.doi.org/10.1144/pgc8.8.

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AbstractThe Namurian and Westphalian sequences from the onshore well Scaftworth-B2, located in the Gainsborough Trough, central England, have been analysed for whole-rock inorganic geochemical data via inductively coupled plasma optical emission spectrometry (ICP-OES) and mass spectrometry (MS). The changes within key elements, and elemental ratios, results in a chemostratigraphic zonation scheme consisting of eight chemostratigraphic sequences and 13 chemostratigraphic packages, providing the type zonation for the Bowland Shale and overlying formations. Mineralogical data are provided by whole rock X-ray diffraction (XRD) and are used to calibrate the mineral modelling in order to generate a modelled mineral log for the study well. Furthermore, the modelled mineralogy is then used to calculate a relative brittleness for the samples, which can then be collaborated with traditional rock properties data at a later date. Elemental data can also be used to model the relative abundance of detrital quartz and biogenic silica; while total silicon is detected by ICP, biogenic silica is not detected by XRD owing to its amorphous nature. Enrichment factors calculated from the inorganic elemental data suggest that the sediment was deposited in an unrestricted marine setting, which experienced periods of anoxia.

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Tolu, Julie, Johan Rydberg, Carsten Meyer-Jacob, Lorenz Gerber, and Richard Bindler. "Spatial variability of organic matter molecular composition and elemental geochemistry in surface sediments of a small boreal Swedish lake." Biogeosciences 14, no. 7 (April 3, 2017): 1773–92. http://dx.doi.org/10.5194/bg-14-1773-2017.

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Abstract. The composition of sediment organic matter (OM) exerts a strong control on biogeochemical processes in lakes, such as those involved in the fate of carbon, nutrients and trace metals. While between-lake spatial variability of OM quality is increasingly investigated, we explored in this study how the molecular composition of sediment OM varies spatially within a single lake and related this variability to physical parameters and elemental geochemistry. Surface sediment samples (0–10 cm) from 42 locations in Härsvatten – a small boreal forest lake with a complex basin morphometry – were analyzed for OM molecular composition using pyrolysis gas chromatography mass spectrometry for the contents of 23 major and trace elements and biogenic silica. We identified 162 organic compounds belonging to different biochemical classes of OM (e.g., carbohydrates, lignin and lipids). Close relationships were found between the spatial patterns of sediment OM molecular composition and elemental geochemistry. Differences in the source types of OM (i.e., terrestrial, aquatic plant and algal) were linked to the individual basin morphometries and chemical status of the lake. The variability in OM molecular composition was further driven by the degradation status of these different source pools, which appeared to be related to sedimentary physicochemical parameters (e.g., redox conditions) and to the molecular structure of the organic compounds. Given the high spatial variation in OM molecular composition within Härsvatten and its close relationship with elemental geochemistry, the potential for large spatial variability across lakes should be considered when studying biogeochemical processes involved in the cycling of carbon, nutrients and trace elements or when assessing lake budgets.

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Gill, Thomas E., Dale A. Gillette, Tezz Niemeyer, and Russell T. Winn. "Elemental geochemistry of wind-erodible playa sediments, Owens Lake, California." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 189, no. 1-4 (April 2002): 209–13. http://dx.doi.org/10.1016/s0168-583x(01)01044-8.

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Naeem, Kashif, Wasim Yawar, Tariq M. Bhatti, and Bashir Mohammad. "Elemental profile of black shales." Chinese Journal of Geochemistry 30, no. 2 (April 26, 2011): 217–19. http://dx.doi.org/10.1007/s11631-011-0503-9.

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McLennan, S. M., R. B. Anderson, J. F. Bell, J. C. Bridges, F. Calef, J. L. Campbell, B. C. Clark, et al. "Elemental Geochemistry of Sedimentary Rocks at Yellowknife Bay, Gale Crater, Mars." Science 343, no. 6169 (December 9, 2013): 1244734. http://dx.doi.org/10.1126/science.1244734.

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Kontorovich, A. E., L. I. Bogorodskaya, L. S. Borisova, L. M. Burshtein, Z. R. Ismagilov, O. S. Efimova, E. A. Kostyreva, et al. "Geochemistry and catagenetic transformation of kerogen from the bazhenov horizon." Геохимия 64, no. 6 (June 26, 2019): 585–93. http://dx.doi.org/10.31857/s0016-7525646585-593.

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A representative suite of 276 samples was used to study the isotopic and element geochemistry of kerogens from the Bazhenov horizon (Bazhenov Formation and its time equivalents) of the West Siberian sedimentary basin and to construct maps reflecting changes in the elemental composition of kerogen. The elemental composition of kerogen was used to determine the types of organic matter (H and C contents), the initial components of the living matter, the sources of kerogen (H and N contents), diagenetic history of organic matter (S content), the level of catagenetic transformation (C and O contents). Kerogen from the central, western and southern regions of the West Siberian basin toward the boundary of the Bazhenov horizon pinch-out shows strong enrichment in hydrogen (up to 8–9%) and 12С (δ13С‰ from -35 to -29), suggesting its derivation from the polymer lipids of aquatic origin. Kerogen from the Bazhenov horizon (catagenetic grade MC1) in the northeast of the basin contains much lower hydrogen concentrations (2–4%). A map of organic matter types in the Bazhenov horizon was constructed.

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Dubey, P. N., B. P. Bhaskar, P. Chandran, B. Singh, and B. K. Mishra. "Geochemistry of some ferruginous soils of Kerala, India." Journal of Applied and Natural Science 8, no. 1 (March 1, 2016): 196–207. http://dx.doi.org/10.31018/jans.v8i1.773.

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The four representative ferruginous soils on lateritic cover developed over Precambrian rocks in parts of Kottayam of Kerala were studied to understand the weathering pattern and genesis through geochemistry. These soils are strongly to moderately acidic, reddish brown with low Cation exchange capacity CEC and base saturation having SiO2 - 33 to 57%, Al2O3 - 16-31%, Fe2O3 - 8 to 15% and TiO2 -0.7 to 1.4%. Kanjirapalli (P3) and Athirampuzha (P4) soil series were more intensely weathered as compared to the Kinalur (P1) and Chingavanam series (P2) with silica to alumina -iron ratio less than 2 and had a significant negative relationship with Chemical index of alteration CIA ( -0.75**), Harnois index ( -0.678**), Richie index (-0.953**) and Plagioclase Index of Weathering (-0.705**). The trace elemental concentration ranges were above the values of world soils having an enrichment index more than 1 in Kanjirapalli series (P3) and Ni contamination in genetic horizons (Ni > 200Âµgg-1 ). The cluster analysis showed similar major oxide concentration pattern in Group -1 and Group - 2 but varied in trace elemental pattern with Cr > Ba > Cu in Group - 1 and Cu > Cr > Ba in Group- 2 soils whereas Zr > Ni > Mn in Group - 3 to Ni > Mn > Zr in Group - 4 soils. The study further showed that differential rate of weathering in soils under tropical climate was further accelerated due to anthropogenic activities such as improper land use practices and deforestation on sleep slopes.

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Shirai, K., T. Watanabe, N. Takahata, and Y. Sano. "Elemental fractionation in biogenic calcium carbonates." Geochimica et Cosmochimica Acta 70, no. 18 (August 2006): A588. http://dx.doi.org/10.1016/j.gca.2006.06.1091.

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Gentzis, Thomas, Ioannis K. Oikonomopoulos, and Catherine Chague-Goff. "Lignites from the Plains region of Alberta, Canada—Part 2: Elemental geochemistry." Energy Sources, Part A: Recovery, Utilization, and Environmental Effects 38, no. 11 (May 26, 2016): 1628–34. http://dx.doi.org/10.1080/15567036.2014.940094.

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Spivack, Arthur J., Miriam Kastner, and Barbara Ransom. "Elemental and Isotopic Chloride Geochemistry and Fluid Flow in the Nankai Trough." Geophysical Research Letters 29, no. 14 (July 2002): 6–1. http://dx.doi.org/10.1029/2001gl014122.

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Flitsiyan, E. "Use of neutron-activation techniques for studying elemental distributions. Applications to geochemistry." Journal of Alloys and Compounds 275-277 (July 1998): 918–23. http://dx.doi.org/10.1016/s0925-8388(98)00485-x.

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Wan, Dejun, Zhangdong Jin, and Yinxi Wang. "Geochemistry of eolian dust and its elemental contribution to Lake Qinghai sediment." Applied Geochemistry 27, no. 8 (August 2012): 1546–55. http://dx.doi.org/10.1016/j.apgeochem.2012.03.009.

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Laceby, J. Patrick, Nina E. Saxton, Kate Smolders, Justine Kemp, Stephen J. Faggotter, Tanya Ellison, Doug Ward, Morag Stewart, and Michele A. Burford. "The effect of riparian restoration on channel complexity and soil nutrients." Marine and Freshwater Research 68, no. 11 (2017): 2041. http://dx.doi.org/10.1071/mf16338.

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Restoration of riparian vegetation may reduce nutrient and sediment contamination of waterways while potentially enhancing stream channel complexity. Accordingly, the present study used a paired-site approach to investigate the effects of mature regrowth riparian vegetation on river channel morphology and soil nutrients (i.e. nitrogen and phosphorus), comparing four sites of degraded (pasture) and reforested reaches. A revised rapid assessment of riparian condition (RARC) was used to validate the site pairings. Riparian soil nutrient and elemental geochemistry were compared between paired sites, along with two parameters of channel width complexity and two for channel slope complexity. The RARC analysis confirmed the validity of the paired site design. The elemental geochemistry results indicated that underlying geology may affect the paired site analyses. Reaches with mature regrowth vegetation had greater channel width complexity but no difference in their riverbed slope complexity. In addition, degraded reaches had higher soil nutrient (i.e. nitrogen and phosphorus) concentrations, potentially indicative of the greater nutrient retention of pasture grass sites compared with mature regrowth forested reaches with less ground cover. Overall, the present study indicates that restoring mature regrowth riparian vegetation may increase river channel width complexity, although it may require canopy management to optimise the nutrient retention potential necessary to maximise the effect of riparian restoration strategies on freshwater environments.

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Lv, Congcong, Xueqin Zhao, Yaoxi Jiang, Heyan Zhu, Hongmin Zhang, Fudong Wang, Qiongfang Li, and Keli Hou. "Insights into Alpine-Karst-Type Tufa Deposits in Geological Environmental Records: A Case Study of the Calcareous Tufa Profile of the Jiuzhaigou Natural Reserve on the Eastern Margin of the Tibetan Plateau." Minerals 13, no. 1 (January 13, 2023): 120. http://dx.doi.org/10.3390/min13010120.

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To study the geological environmental records of alpine-karst-type tufa deposits in the eastern margin of the Tibetan Plateau, the calcareous tufa profile exposed by the “8.8” Jiuzhaigou earthquake was taken as the research object and combined with a field geological investigation. Further, the petrography, sedimentology, chronology, and elemental geochemistry of the calcareous tufa were studied and analyzed. The results show the following. (1) The Sparkling Lake calcareous tufa profile was deposited under the background of a warm and humid climate during the Holocene. The growth pattern follows a bottom-to-top deposition. (2) At 750 ± 30–300 ± 30 aB.P., the calcareous tufa layers were gray-black as a whole, and the changes in mineral composition and elemental geochemistry indicate a fluctuating upward trend for temperature and precipitation during this period. (3) The formation of two sets of black peat layers in the upper part of the tufa calcareous profile is due to the synergistic action of multiple factors caused by strong tectonic activity. In conclusion, the deposition mechanism of the calcareous tufa in Jiuzhaigou was controlled by paleoclimate hydrology and glaciation for a long time, while strong tectonic activity over a short period of time considerably changed the color, structure, element content, and mineral composition of the calcareous tufa.

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Sendjaja, P., A. Kusniadi, and V. E. Setiawan. "Central Java regional geochemistry: influence of environmental geology and mineral occurrences." IOP Conference Series: Earth and Environmental Science 1027, no. 1 (May 1, 2022): 012001. http://dx.doi.org/10.1088/1755-1315/1027/1/012001.

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Abstract Stream sediments geochemical surveys were undertaken in Central Java, Indonesia as a part of the Geological Agency’s geochemical mapping project with support from several universities. A total of 1583 stream sediment samples were collected from Central Java and analyzed using X-Ray Fluoresces for 29 elements. Geochemical maps were processed by the GIS software. Based on the overlay between geological and geochemical maps, there are several elemental anomalies, for example, the ultramafic formation from Kebumen showing distinctive Chromium (Cr), Cobalt (Co), and Magnesium (Mg) anomalies. Meanwhile, the potassic igneous rocks from Muria Mountain have Cerium (Ce), Lanthanum (La), and Zirconium (Zr) anomalies. Elemental anomalies related to mineral resources and mining areas such as Arsenic (As), Copper (Cu), and Lead (Pb) are found in Trenggalek, Pacitan, and Kebumen; while Barium (Ba), Iron (Fe), and Manganese (Mn) are scattered along the southern coast of Central Java. Anthropogenic elements (Chlorine (Cl), Ce, and As) spread along the north coast of Central Java probably because of pollution by industrial, farming, and urban areas. Heavy metals pollutions that were identified previously in the Bengawan Solo River flow can be seen on this geochemical map which can convincingly delineate elements anomalies due to geological and environmental conditions.

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Lucey, Paul G. "Remote geochemical analysis: elemental and mineralogical composition." Geochimica et Cosmochimica Acta 58, no. 20 (October 1994): 4531–32. http://dx.doi.org/10.1016/0016-7037(94)90356-5.

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Ajayi, Oyinkansola, Carlos Torres-Verdín, and William E. Preeg. "Inversion-based interpretation of logging-while-drilling gamma-ray spectroscopy measurements." GEOPHYSICS 81, no. 1 (January 1, 2016): D9—D34. http://dx.doi.org/10.1190/geo2015-0293.1.

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Neutron-induced spectroscopy measurements are commonly used to quantify in situ elemental compositions of rocks from the processing of measured gamma-ray energy spectra. However, geometric effects on the measured spectroscopy logs, such as thin beds, dipping beds, and deviated well trajectories, can cause shoulder-bed averaging that compromises the assessment of the true layer elemental composition. We have developed an inversion-based interpretation method to evaluate layer elemental compositions from spectroscopy measurements acquired with a commercial 14-MeV pulsed-neutron logging-while-drilling spectroscopy tool. The algorithm is based on a new spectroscopy fast-forward simulation technique, and it estimates layer-by-layer elemental relative yields, weight concentrations, and their uncertainties. Calculations are performed with inelastic and capture gamma-ray spectroscopy measurements that arose from high- and low-energy neutron interactions, respectively. This strategy provides two sets of data that independently validate estimated elemental compositions and can ascertain chemical elements present in only one measurement mode. In laminated formations in which layer thicknesses are appreciably below the vertical resolution of the tool, it is impossible to quantify layer properties with inversion methods. We have therefore developed an additional interpretation method based on a spectroscopy mixing law to estimate elemental compositions within individual laminae. The new inversion-based interpretation methods were successfully verified with two challenging synthetic cases and implemented in two field cases with varying lithology and well trajectories. Our results found that the developed methods reduced shoulder-bed averaging effects on the measured spectroscopy logs by as much as a 0.4 yield fraction and a 0.17 weight fraction. Estimated elemental compositions with reduced shoulder-bed averaging effects improved the calculations in subsequent spectroscopy-based petrophysical interpretation.

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Marquis, F., and D. Paré. "The role of permanent site factors in the assessment of soil treatment effects: A case study with a site preparation trial in jack pine plantations on glacial outwashes." Canadian Journal of Soil Science 89, no. 1 (February 1, 2009): 81–91. http://dx.doi.org/10.4141/cjss06044.

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In silvicultural trials, the confounding influence of permanent soil properties is assumed to be minimal. A covariance analysis using total elemental concentrations of parent material (geochemistry) and soil particle size distribution (texture) was used to understand the role that these variables could play in tree growth and foliar nutrient status, and in the growth response to site preparation of 16- to18-yr-old jack pine plantations growing on seemingly homogeneous glacial outwash deposits. Three treatments were tested in a replicated design: direct plantation, and site preparation with TTS or with Bräcke. The combination of particle size distribution and soil geochemistry explained the site quality index (SQI) in control plots (R2 = 0.94) better than soil texture alone. In all plots, SQI was strongly related to K and Mg concentrations in foliage and in humus and, to a lesser degree, to foliar N concentrations. A covariance analysis using soil texture and geochemical composition indicated that while site preparation had an effect on tree growth, the sites that responded the most to site preparation were the ones with the lowest growth potential as determined by soil texture and geochemistry. Key words: Silviculture, site preparation, site quality index, growth, permanent soil factors, texture, geochemistry, nutrition

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Heřmanská, Matylda, Barbara I. Kleine, and Andri Stefánsson. "Supercritical Fluid Geochemistry in Geothermal Systems." Geofluids 2019 (August 5, 2019): 1–14. http://dx.doi.org/10.1155/2019/6023534.

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Supercritical fluids exist in the roots of many active high-temperature geothermal systems. Utilization of such supercritical resources may multiply energy production from geothermal systems; yet, their occurrence, formation mechanism, and chemical properties are poorly constrained. Flow-through experiments at 260°C and 400-420°C were performed to study the chemical and mineralogical changes associated with supercritical fluid formation near shallow magmatic intrusions by conductive heating and boiling of conventional subcritical geothermal fluids. Supercritical fluids formed by isobaric heating of liquid geothermal water had similar volatile element concentrations (B, C, and S) as the subcritical water. In contrast, mineral-forming element concentrations (Si, Na, K, Ca, Mg, and Cl) in the supercritical fluid were much lower. The results are consistent with the observed mineral deposition of quartz, aluminum silicates, and minor amount of salts during boiling. Similar concentration patterns have been predicted from geochemical modeling and were observed at Krafla, Iceland, for the IDDP-1 supercritical fluid discharge. The experimental results confirm previous findings that supercritical fluids may originate from conductive heating of subcritical geothermal reservoir fluids characterized by similar or lower elemental concentrations with minor input of volcanic gas.

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Nironen, M., and O. T. Rämö. "The Oripää granite revisited: Elemental geochemistry, Nd isotopes, and implication to terrane boundary." Bulletin of the Geological Society of Finland 83, no. 2 (December 2011): 115–22. http://dx.doi.org/10.17741/bgsf/83.2.003.

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Wang, Hongliang, Zehua Zhang, Jintong Liang, Huimin Liu, and Shige Shi. "Application of Elemental Geochemistry in High-Frequency Sequence—Stratigraphic Analysis of Lacustrine Shale." Minerals 11, no. 6 (June 21, 2021): 657. http://dx.doi.org/10.3390/min11060657.

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The successful development of shale gas and oil in North America has created considerable interest in shale. The analysis of genetic types, the sedimentary environment, and the mudstone development mechanism within sequences is critical for evaluating shale gas and oil exploration prospects, exploration favorable zones, and resource potential. This study focused on the shale of Shahejie Formation in Dongying Depression of Bohai Bay Basin. Shale lithofacies division, geochemical analysis, and well-log analysis were performed for a sedimentary environment and its related elemental response characteristics’ identification. Based on the results, we concluded that the sedimentary environment of the lake basin evolved from the saltwater lake to the ambiguous lake and then the open lake to the delta. In response, we observed gradually decreasing Sr/Ba and Ca/Mg ratios and increasing Rb/Ca and Fe/Mn ratios during the whole process during the reduction of the salinity and the decrease in PH value and sediments’ transport distance. The relationship between ratio elements and high-frequency sequences was initially established within the shale strata. Our results show that ratios of Sr/Ba and Ca/Mg ratios near the sequence boundary are relatively low, and ratios of Fe/Mn and Rb/Ca are relatively high, while ratios of Sr/Ba and Ca/Mg near the flooding surface are relatively high, and ratios of Fe/Mn and Rb/Ca are relatively low. Those features can be used as a marker for high-frequency sequence division of shale strata. Our results provided a new theoretical basis and technical method for shale gas and oil exploration and development.

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Renson, Virginie, Nathalie Fagel, Nadine Mattielli, Serge Nekrassoff, Maurice Streel, and François De Vleeschouwer. "Roman road pollution assessed by elemental and lead isotope geochemistry in East Belgium." Applied Geochemistry 23, no. 12 (December 2008): 3253–66. http://dx.doi.org/10.1016/j.apgeochem.2008.06.010.

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Chengmin, Huang, Gong Zitong, and He Yurong. "Elemental geochemistry of a soil chronosequence on basalt on northern Hainan Island, China." Chinese Journal of Geochemistry 23, no. 3 (July 2004): 245–54. http://dx.doi.org/10.1007/bf02842072.

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Mani, Devleena, B. Ratnam, M. S. Kalpana, D. J. Patil, and A. M. Dayal. "Elemental and organic geochemistry of Gondwana sediments from the Krishna–Godavari Basin, India." Geochemistry 76, no. 1 (March 2016): 117–31. http://dx.doi.org/10.1016/j.chemer.2016.01.002.

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Doherty, Cathleen L., and Brian T. Buckley. "Translating Analytical Techniques in Geochemistry to Environmental Health." Molecules 26, no. 9 (May 10, 2021): 2821. http://dx.doi.org/10.3390/molecules26092821.

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From human health exposure related to environmental contamination to ancient deep-Earth processes related to differentiation of the Earth’s geochemical reservoirs, the adaptability of inductively coupled plasma mass spectrometry (ICP-MS) has proven to be an indispensable standard technique that transcends disciplines. Continued advancements in ICP-MS, including improved auxiliary applications such as laser ablation (LA), ion/liquid chromatography (IC), automated pre-concentration systems (e.g., seaFAST), and improved desolvating nebulizer systems (e.g., Aridus and Apex) have revolutionized our ability to analyze almost any sample matrix with remarkable precision at exceedingly low elemental abundances. The versatility in ICP-MS applications allows for effective interdisciplinary crossover, opening a world of analytical possibilities. In this communication, we discuss the adaptability of geochemical techniques, including sample preparation and analysis, to environmental and biological systems, using Pb isotopes for source apportionment as a primary example.

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Chen, Nan, Ying Shu Li, Jiao Jiao Chen, Lun Wang, Yi Ke Zhang, and Da Qing He. "Geochemical Characteristics and Ore Prediction of the Pb-Zn Polymetallic District in Kanmashan of Lancang County, Yunnan." Advanced Materials Research 634-638 (January 2013): 3380–84. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.3380.

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According to the analysis of geological characteristics and Elemental correlation charac –teristics, Threshold and R-factor analysis leading to the results geochemistry characteristics of Kanmashan Pb-Zn polymetallic deposit which is located in Lancang county of Yunnan province, the deposit is discovered in the southern arc of Chong mountain-lincang-menghai mountain, alonging the contact strip of Lincang granitoid batholith and proterozoic group in LanCang, metallogenic conditions near fracture is relatively ideal, which can be used as a further work area.

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Workman, R. K., M. Boettcher, and P. D. Asimow. "Elemental budget and rheology of the oceanic lithosphere." Geochimica et Cosmochimica Acta 70, no. 18 (August 2006): A708. http://dx.doi.org/10.1016/j.gca.2006.06.1535.

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Cosmidis, Julie, Christine W. Nims, David Diercks, and Alexis S. Templeton. "Formation and stabilization of elemental sulfur through organomineralization." Geochimica et Cosmochimica Acta 247 (February 2019): 59–82. http://dx.doi.org/10.1016/j.gca.2018.12.025.

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Boyle, E. "Isotopic and Elemental Tracers in Calcium Carbonate Fossils." Mineralogical Magazine 58A, no. 1 (1994): 111–12. http://dx.doi.org/10.1180/minmag.1994.58a.1.61.

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Mason, R. P., W. F. Fitzgerald, and F. M. M. Morel. "The biogeochemical cycling of elemental mercury: Anthropogenic influences." Geochimica et Cosmochimica Acta 58, no. 15 (August 1994): 3191–98. http://dx.doi.org/10.1016/0016-7037(94)90046-9.

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Rivers, M. L., S. R. Sutton, and M. Newville. "3-D Elemental imaging by synchrotron computed microtomography." Geochimica et Cosmochimica Acta 70, no. 18 (August 2006): A536. http://dx.doi.org/10.1016/j.gca.2006.06.988.

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Shirai, Kotaro, Bernd R. Schöne, Tsuzumi Miyaji, Pascal Radarmacher, Richard A. Krause, and Kazushige Tanabe. "Assessment of the mechanism of elemental incorporation into bivalve shells (Arctica islandica) based on elemental distribution at the microstructural scale." Geochimica et Cosmochimica Acta 126 (February 2014): 307–20. http://dx.doi.org/10.1016/j.gca.2013.10.050.

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Garbisu, Carlos, Takahisa Ishii, Terrance Leighton, and Bob B. Buchanan. "Bacterial reduction of selenite to elemental selenium." Chemical Geology 132, no. 1-4 (October 1996): 199–204. http://dx.doi.org/10.1016/s0009-2541(96)00056-3.

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Zhuk, L. I., and A. A. Kist. "Elemental hair composition as a biogeochemical indicator." Chemical Geology 70, no. 1-2 (August 1988): 21. http://dx.doi.org/10.1016/0009-2541(88)90244-6.

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Itiowe, K., F. A. Lucas, and E. O. Avwenagha. "Geochemical Analysis of Sediments from Sahaiawei-1 Well of the Northern Delta Depobelt in the Niger Delta Basin, Nigeria." Journal of Scientific Research 13, no. 1 (January 1, 2021): 125–35. http://dx.doi.org/10.3329/jsr.v13i1.48455.

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Geochemical analysis of sediments from Sahaiawei-1 Well of the Northern Delta Depobelt in the Niger Delta Basin was carried out to classify the sediments, determine the provenance, tectonic setting and depositional environment. Twenty (20) ditch cutting samples between 1500 and 10730 ft. were subjected to X-ray fluorescence analysis to determine the elemental composition. The result for the classification of the sediments shows that the sediments were classified as Fe-shale and Fe-sand. The discriminant function diagrams for provenance signature and tectonic setting show that the sediments were plotted within the quartzose sedimentary provenance and passive continental margin tectonic setting fields respectively. The depositional environment using inorganic geochemistry shows that the sediments were deposited with in the continental, transitional and marine environments. This research has provided up to date information on the geochemistry of the Northern Delta Depobelt which would help in hydrocarbon exploration in the area.

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Itiowe, K., F. A. Lucas, and E. O. Avwenagha. "Geochemical Analysis of Sediments from Sahaiawei-1 Well of the Northern Delta Depobelt in the Niger Delta Basin, Nigeria." Journal of Scientific Research 13, no. 1 (January 1, 2021): 125–35. http://dx.doi.org/10.3329/jsr.v13i1.48455.

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Abstract:

Geochemical analysis of sediments from Sahaiawei-1 Well of the Northern Delta Depobelt in the Niger Delta Basin was carried out to classify the sediments, determine the provenance, tectonic setting and depositional environment. Twenty (20) ditch cutting samples between 1500 and 10730 ft. were subjected to X-ray fluorescence analysis to determine the elemental composition. The result for the classification of the sediments shows that the sediments were classified as Fe-shale and Fe-sand. The discriminant function diagrams for provenance signature and tectonic setting show that the sediments were plotted within the quartzose sedimentary provenance and passive continental margin tectonic setting fields respectively. The depositional environment using inorganic geochemistry shows that the sediments were deposited with in the continental, transitional and marine environments. This research has provided up to date information on the geochemistry of the Northern Delta Depobelt which would help in hydrocarbon exploration in the area.

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Declercq, Ynse, Nele Delbecque, Johan De Grave, Philippe De Smedt, Peter Finke, Abdul M. Mouazen, Said Nawar, Dimitri Vandenberghe, Marc Van Meirvenne, and Ann Verdoodt. "A Comprehensive Study of Three Different Portable XRF Scanners to Assess the Soil Geochemistry of An Extensive Sample Dataset." Remote Sensing 11, no. 21 (October 24, 2019): 2490. http://dx.doi.org/10.3390/rs11212490.

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The assessment of soil elemental concentrations nowadays mainly occurs through conventional laboratory analyses. However, proximal soil sensing (PSS) techniques such as X-ray fluorescence (XRF) spectrometry are proving to reduce analysis time and costs, and thus offer a worthy alternative to laboratory analyses. Moreover, XRF scanners are non-destructive and can be directly employed in the field. Although the use of XRF for soil elemental analysis is becoming widely accepted, most previous studies were limited to one scanner, a few samples, a few elements, or a non-diverse sample database. Here, an extensive and diverse soil database was used to compare the performance of three different XRF scanners with results obtained through conventional laboratory analyses. Scanners were used in benchtop mode with built-in soil calibrations to measure the concentrations of 15 elements. Although in many samples Cu, S, P, and Mg concentrations were up to 6, 12, 13, and 5 times overestimated by XRF, and empirical recalibration is recommended, all scanners produced acceptable results, even for lighter elements. Unexpectedly, XRF performance did not seem to depend on soil characteristics such as CaCO3 content. While performances will be worse when expanding to the field, our results show that XRF can easily be applied by non-experts to measure soil elemental concentrations reliably in widely different environments.

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Jian, Long, Fu Ju Jia, and Yan Dao. "Geochemical Characteristics of Ore-Bearing Strata of Pb-Zn Deposits in the Sichuan-Yunnan-Guizhou Border Area in Southwest China." Advanced Materials Research 868 (December 2013): 113–16. http://dx.doi.org/10.4028/www.scientific.net/amr.868.113.

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The Pb-Zn deposits (or points) with different ages of ore-bearing strata are counted in in the paper. Through discussing the lithology and elemental geochemistry in ore-bearing strata to explain the lead element and zinc element relate to strata and lithology, the author suggested the lead-zinc deposit mainly were exposed in specific stratum, considering the deposits was obviously was controlled by stratum and was greatly influenced by lithology. For this reason, combining with the comparative study of element abundances in rock, it has maily demonstrated the relevance of ore-forming elements.

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Rosales-Hoz, L., A. Carranza-Edwards, C. Mendez-Jaime, and M. A. Monreal-Gómez. "Metals in shelf sediments and their association with continental discharges in a tropical zone." Marine and Freshwater Research 50, no. 3 (1999): 189. http://dx.doi.org/10.1071/mf98107.

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Geochemical studies of shelf sediments of the south-eastern Gulf of Mexico were carried out to understand the influence of fluvial and fluvio–lagoonal discharges on sediment geochemistry and to study elemental distribution patterns that could be used together with hydrographic and sedimentological data to assess depth circulation. On the basis of sediment chemical composition, three provinces were identified: fluvial, fluvio–lagoonal and calcareous; their distribution is a function of circulation patterns and fluvio and fluvio–lagoonal discharges. Factor analysis separated the sediments into three groups: fluvial influence, anthropic activities and fluvio–lagoonal origin.

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Minyuk, P. S., V. Y. Borkhodoev, and V. Wennrich. "Inorganic geochemistry data from Lake El'gygytgyn sediments: marine isotope stages 6–11." Climate of the Past 10, no. 2 (March 12, 2014): 467–85. http://dx.doi.org/10.5194/cp-10-467-2014.

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Abstract. Geochemical analyses were performed on sediments recovered by deep drilling at Lake El'gygytgyn in central Chukotka, northeastern Russia (67°30' N; 172°05' E). Major and rare element concentrations were determined using X-ray fluorescence spectroscopy (XRF) on the < 250 μm fraction from 617 samples dated to ca. 440 and 125 ka, which approximates marine isotope stages (MIS) 11 to 6. The inorganic geochemistry indicates significant variations in elemental composition between glaciations and interglaciations. Interglacial sediments are characterized by high contents of SiO2, Na2O, CaO, K2O, and Sr and are depleted in Al2O3, Fe2O3, TiO2, and MgO. An extreme SiO2 enrichment during MIS 11.3 and 9.3 was caused by an enhanced flux of biogenic silica (BSi). The geochemical structure of MIS 11 shows similar characteristics as seen in MIS 11 records from Lake Baikal (southeastern Siberia) and Antarctic ice cores, thereby arguing for the influence of global forcings on these records. High sediment content of TiO2, Fe2O3, MgO, Al2O3, LOI, Ni, Cr, and Zr typifies glacial stages, with the most marked increases during MIS 7.4 and 6.6. Reducing conditions during glacial times are indicated by peaks in the Fe2O3 content and coinciding low Fe2O3/MnO ratios. This conclusion also is supported by P2O5 and MnO enrichment, indicating an increased abundance of authigenic, fine-grained vivianite. Elemental ratios (CIA, CIW, PIA, and Rb/Sr) indicate that glacial sediments are depleted in mobile elements, like Na, Ca, K and Sr. This depletion was caused by changes in the sedimentation regime and thus reflects environmental changes.

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Liu, Xiaodong, Liguang Sun, Xuebin Yin, Renbin Zhu, Zhouqing Xie, and Yuhong Wang. "A preliminary study of elemental geochemistry and its potential application in Antarctic Seal palaeoecology." GEOCHEMICAL JOURNAL 39, no. 1 (2005): 47–59. http://dx.doi.org/10.2343/geochemj.39.47.

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FOWLER, M. B. "Elemental and O-Sr-Nd isotope geochemistry of the Glen Dessarry syenite, NW Scotland." Journal of the Geological Society 149, no. 2 (March 1992): 209–20. http://dx.doi.org/10.1144/gsjgs.149.2.0209.

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Brett, E. K. A., J. Prytulak, M. Rehkämper, S. J. Hammond, C. Chauvel, A. Stracke, and M. Willbold. "Thallium elemental and isotopic systematics in ocean island lavas." Geochimica et Cosmochimica Acta 301 (May 2021): 187–210. http://dx.doi.org/10.1016/j.gca.2021.02.035.

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Sassen, Roger, and Elizabeth W. Chinn. "Effects of elemental sulfur during programmed pyrolysis of kerogen." Organic Geochemistry 14, no. 4 (January 1989): 475–77. http://dx.doi.org/10.1016/0146-6380(89)90012-0.

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Tseng, C. M., C. Lamborg, W. F. Fitzgerald, and D. R. Engstrom. "Cycling of dissolved elemental mercury in Arctic Alaskan lakes." Geochimica et Cosmochimica Acta 68, no. 6 (March 2004): 1173–84. http://dx.doi.org/10.1016/j.gca.2003.07.023.

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Rao, C. Prasada. "Cold water polar aragonitic bivalve elemental composition, east Antarctica." Carbonates and Evaporites 14, no. 1 (March 1999): 56–63. http://dx.doi.org/10.1007/bf03176148.

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Selby, David, Robert A. Creaser, and Martin G. Fowler. "Re–Os elemental and isotopic systematics in crude oils." Geochimica et Cosmochimica Acta 71, no. 2 (January 2007): 378–86. http://dx.doi.org/10.1016/j.gca.2006.09.005.

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Journal articles on the topic 'Elemental geochemistry'

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