Dissertations / Theses on the topic 'Amphibolite geochemistry'
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Wang, Weiliang. "Amphibolites of the Bangong-Nujiang suture zone, Tibet." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B41897237.
Full textGuilmette, Carl. "Petrology, geochemistry and geochronology of highly foliated amphibolites from the ophiolitic mélange beneath the Yarlung Zangbo ophiolites, Xigaze area, Tibet : geodynamical implications." Master's thesis, Université Laval, 2005. http://hdl.handle.net/20.500.11794/18102.
Full textBlocks of highly foliated amphibolites are locally found within the serpentinite matrix mélange underlying the Yarlung Zangbo ophiolites near Bainang and Buma, Xigaze area, Yarlung Zangbo Suture Zone (YZSZ), Tibet. The mélange is thought to be the result of the tectonic dismemberment of the base of the ophiolitic napes during its obduction over the Indian passive margin, circa 50 Ma. Prior to dismemberment, amphibolites were probably parts of a coherent dynamothermal sole, as observed at the base of many ophiolites. Sampled amphibolites can be subdivided in three groups: garnet, banded and common amphibolites. Medium-grained garnet amphibolites contain the assemblage A) Hb+CPX+Gt+Pl±Rt and B) Gt+Hb+Pl (corona assemblage). Fine to medium-grained banded amphibolites contain the assemblage C) Hb+CPX+Pl+Ep±Sp+Qtz+Ap. Fine-grained common amphibolites contain facies D) Hb+Pl±Ep+Ap+Sp. In all assemblages, plagioclase is pseudomorphosed by an albite-prehnite simplectite. Retrograde cataclastic veins contain the assemblage E) Ab+Pr±Ch+Ep. The geochemistry of the garnet, banded and common amphibolites is very similar to the geochemistry of other mafic blocks in the mélange and of mafic igneous rocks within the ophiolitic massifs. When compared to MORBs, light depletion of LREE (La/Yb = 0.65-0.97) and mild HFSE depletion (Ta/Th = 0.33-0.65) would suggest a mixing between the IAT and MORB sources, as seen in back-arc basins and nascent intra-oceanic arcs. The amphibolites were buried at the inception of a subduction within the back-arc to peak metamorphism conditions of 11-14 kbars and ~800 °C. Ar/Ar analysis of amphiboles revealed a metamorphic age of 121-130 Ma, which is synchronous with ages obtained from the overlying ophiolites. Overlapping in ophiolite-sole age relationship reveals inception of the subduction near or at the spreading center from which originated the ophiolite. Subduction of a buoyant body could explain heterogeneous coronitization of pyrope-rich (up to 35 %) garnet by Al-Tschermakites (Al2O3 up to 21 wt %) at high-pressures. After exhumation, amphibolites were injected by very fine-grained diabasic dykes and were subject to percolation of a prehnite-precipitating fluid. Oxygen stable isotopes suggest that a magmatic fluid is responsible for prehnite precipitation. The magmatic and metamorphic history of the dynamothermal sole and field relationships with adjacent units seem to indicate that most of Neo-Tethys oceanic domain was subducted along this new Late Cretaceous subduction zone.
Wang, Weiliang, and 王維亮. "Amphibolites of the Bangong-Nujiang suture zone, Tibet." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B41897237.
Full textFernandez, Laure. "Etude géochimique et géochronologique d'un massif basique et ultrabasique des zones internes de la chaîne des Maghrébides (Edough, NE Algégrie) : contraintes sur l'évolution de la Méditerranée Occidentale au Cénozoïque." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS102/document.
Full textThe Edough massif is the Easternmost crystalline massif of the Maghrebide belt. This area presents strong similarities with the internal zones of the Peri-Mediterranean Alpine belt but its evolution stillremains poorly constrained. Edough can be approximated as a metamorphic dome of gneisses and migmatites containing garnet amphibolite and metaperidotites of Sidi Mohamed in its core. In the North, the dome is overlain by a nappe stack constituted by a “melange” unit composed of various lithologies and, upward, by the Kef Lakhal massive amphibolites of oceanic origin. This work is focused on three units containing mafic and ultramafic lithologies i.e. the Sidi Mohamed peridotites, the “melange” unit and the Kef Lakhal amphibolites. The aim of this Ph.D. work is to characterize all three units, to determine their relationships and establish the timing of the main events identified. We chose a combined geochronological-geochemical approach using in situ analyses (major and trace elements, U-Pb geochronology and Hf isotopes on accessory minerals) and bulk analyses on whole rock/mineral fraction (major and trace elements, Ar-Ar geochronology and Sr-Nd-Pb-Hf isotopes). We show that the Sidi Mohamed mafic rocks display an affinity with the Alboran mantle. The mantle rocks from Sidi Mohamed display affinities with a subcontinental mantle influenced by subduction processes and late metamorphism at crustal levels. The melange unit is interpreted as a Permo-Carboniferous passive margin. The amphibolite lenses in the mélange unit originate from a mantle modified by subduction processes. This unit contains relics of Ultra-High Pressure rocks as evidenced by the occurrence of diamonds in a megacrystal of garnet showing oceanic affinities. These ultra-high pressure rocks document a prograde stage at ~32 Ma and exhumation to lower crustal levels at ~21 Ma. The Kef Lakhal unit displays oceanic crust-like signatures and characteristics of fluid induced signatures. We interpret the Kef Lakhal amphibolites as a shallow subducted Tethys fragment, which was exhumed at 21 Ma. We propose that the Edough massif represents the Permo-carboniferous passive margin of Africa basement onto which a fragment of the Tethys Ocean was thrusted. The whole massif was finally exhumed as a metamorphic core complex at 18 Ma and experienced fast cooling until ~16 Ma. We relate this fast processes to the interplay between trench and slab movements
Dalpé, Claude. "Trace element partitioning between amphibole and basaltic melt." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34939.
Full textKuyumjian, Raul Minas. "The geochemistry and tectonic significance of amphibolites from the Chapada sequence, Central Brazil." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47522.
Full textInjoque-Espinoza, J. "Geochemistry of the Cu-Fe-amphibole skarn deposits of the Peruvian coast." Thesis, University of Nottingham, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355424.
Full textCHWAE, Ueechan, Izumi KAJIZUKA, Daniel J. DUNKLEY, and Kazuhiro SUZUKI. "A preliminary report on the geochemistry of amphibolites from the Chuncheon area in the Gyeonggi massif, Korea." Dept. of Earth and Planetary Sciences, Nagoya University, 2009. http://hdl.handle.net/2237/14731.
Full textRosatelli, Gianluigi. "The petrogenesis of carbonitic rocks and their relation to mantle amphibole and carbonate as exemplified in contrasting volcanoes from Vulture, Italy and Rangwa, East Africa." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252281.
Full textCollins, Nathan. "Geochemical Systematics Among Amphibolitic Rocks in the Central Blue Ridge Province of southwestern North Carolina." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3045.
Full textGuilmette, Carl. "Petrology, geochemistry and geochronology of highly foliated amphibolites from the ophiolitic melange beneath the Yarlung zangbo ophiolites, Xigaze area, Tibet. Geodynamical implications." Thesis, Université Laval, 2005. http://www.theses.ulaval.ca/2005/22943/22943.pdf.
Full textBlocks of highly foliated amphibolites are locally found within the serpentinite matrix mélange underlying the Yarlung Zangbo ophiolites near Bainang and Buma, Xigaze area, Yarlung Zangbo Suture Zone (YZSZ), Tibet. The mélange is thought to be the result of the tectonic dismemberment of the base of the ophiolitic napes during its obduction over the Indian passive margin, circa 50 Ma. Prior to dismemberment, amphibolites were probably parts of a coherent dynamothermal sole, as observed at the base of many ophiolites. Sampled amphibolites can be subdivided in three groups: garnet, banded and common amphibolites. Medium-grained garnet amphibolites contain the assemblage A) Hb+CPX+Gt+Pl±Rt and B) Gt+Hb+Pl (corona assemblage). Fine to medium-grained banded amphibolites contain the assemblage C) Hb+CPX+Pl+Ep±Sp+Qtz+Ap. Fine-grained common amphibolites contain facies D) Hb+Pl±Ep+Ap+Sp. In all assemblages, plagioclase is pseudomorphosed by an albite-prehnite simplectite. Retrograde cataclastic veins contain the assemblage E) Ab+Pr±Ch+Ep. The geochemistry of the garnet, banded and common amphibolites is very similar to the geochemistry of other mafic blocks in the mélange and of mafic igneous rocks within the ophiolitic massifs. When compared to MORBs, light depletion of LREE (La/Yb = 0.65-0.97) and mild HFSE depletion (Ta/Th = 0.33-0.65) would suggest a mixing between the IAT and MORB sources, as seen in back-arc basins and nascent intra-oceanic arcs. The amphibolites were buried at the inception of a subduction within the back-arc to peak metamorphism conditions of 11-14 kbars and ~800 °C. Ar/Ar analysis of amphiboles revealed a metamorphic age of 121-130 Ma, which is synchronous with ages obtained from the overlying ophiolites. Overlapping in ophiolite-sole age relationship reveals inception of the subduction near or at the spreading center from which originated the ophiolite. Subduction of a buoyant body could explain heterogeneous coronitization of pyrope-rich (up to 35 %) garnet by Al-Tschermakites (Al2O3 up to 21 wt %) at high-pressures. After exhumation, amphibolites were injected by very fine-grained diabasic dykes and were subject to percolation of a prehnite-precipitating fluid. Oxygen stable isotopes suggest that a magmatic fluid is responsible for prehnite precipitation. The magmatic and metamorphic history of the dynamothermal sole and field relationships with adjacent units seem to indicate that most of Neo-Tethys oceanic domain was subducted along this new Late Cretaceous subduction zone.
Haley, Maureen Y. "Mineralogical Perspectives: Using Mineral Chemistry to Unravel the Magmatic Architecture of Granitic Batholiths." Miami University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami1547567947436507.
Full textScanlan, Mary K. "Petrology of Inclusion-Rich Lavas at Minna Bluff, McMurdo Sound, Antarctica: Implications for Magma Origin, Differentiation, and Eruption Dynamics." Bowling Green, Ohio : Bowling Green State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1217952842.
Full textLaurs, Brendan M. "Emerald mineralization and amphibolite wall-rock alteration at the Khaltaro pegmatite-hydrothermal vein system, Haramosh Mountains, Northern Pakistan." Thesis, 1995. http://hdl.handle.net/1957/35382.
Full textKernich, A. "Weathering, erosion and element mobilisation in a catchment at the Luxemburg Copper/Gold site, Olary Domain, South Australia." Thesis, 2002. http://hdl.handle.net/2440/113085.
Full textThe Olary Domain, Curnamona Province has significant economic importance as a target for base metal and gold exploration. A veneer of Cainozoic or younger regolith occurs over large areas of the Olary Domain, which complicates mineral exploration. The study area is located within a small catchment at the old Luxemburg Cu/Au mining site in the mid North of South Australia in the Southern area of the Olary Domain. This investigation focuses on relating physical and chemical weathering processes present between basement amphibolite, granites and gneisses and a local waterway, including parameters such as bedrock geochemistry, regolith profile interpretation, channel morphology, and landscape evolution. Mapping the extent and character of the regolith in the Luxemburg area in a detailed Regolith Landform Map was also a large feature of this study. Results from the Regolith Landform Map allow inferences on the present day surface dispersion pathways. Geochemical investigations of the regolith profile within the catchment indicate a considerable fingerprint from the underlying amphibolite, specifically shown by Fe, Ti, Ni, Cr, V and Sc values. The elemental signature of the surface regolith reflects the underlying parent regolith units. Geochemical patterns within the ephemeral channel can be related to source geology, streambed morphology and landscape position. Harker plots and grain size analysis indicate that the channel sediment is chemically immature and La/Sc plots against Ti, Zr and Th illustrate that the amphibolite body primarily controls its elemental signature. The geochemistry of the underlying moderately weathered bedrock can be seen and deciphered in an area of iron rich, relatively thin regolith. Bedrock signatures are also evident within the chemistry of bulk samples from the local ephemeral channel deposits. Recent mining activity within the area does not seem to have influenced the results of this study.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2002
Cisneros, Miguel. "An experimental calibration of chlorine isotope fractionation between amphibole and fluid at 700 °C and 0.2 GPa." 2013. http://hdl.handle.net/2152/21840.
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Kirchner, Timo. "Sr behaviour during hydrothermal alteration of oceanic gabbros exposed at Hess Deep : implications for 87SR/86SR compositions as a proxy for fluid-rock interaction." Thesis, 2011. http://hdl.handle.net/1828/3314.
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"Petrology, geochemistry and geochronology of highly foliated amphibolites from the ophiolitic melange beneath the Yarlung zangbo ophiolites, Xigaze area, Tibet. Geodynamical implications." Thesis, Université Laval, 2005. http://www.theses.ulaval.ca/2005/22943/22943.pdf.
Full textLarocque, Jeffrey Paul. "The role of amphibole in the evolution of arc magmas and crust: the case from the Jurassic Bonanza arc section, Vancouver Island, Canada." Thesis, 2008. http://hdl.handle.net/1828/1309.
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