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Статті в журналах з теми "Palghat- Cauvery Shear System"

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Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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1

SANTOSH, M. "Gemstone Mineralization in the Palghat-Cauvery Shear Zone System (Karur-Kangayam Belt), Southern India." Gondwana Research 6, no. 4 (October 2003): 911–18. http://dx.doi.org/10.1016/s1342-937x(05)71035-2.

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2

KOSHIMOTO, Saori, Toshiaki TSUNOGAE, and M. SANTOSH. "Sapphirine and corundum bearing ultrahigh temperature rocks from the Palghat-Cauvery Shear System, southern India." Journal of Mineralogical and Petrological Sciences 99, no. 5 (2004): 298–310. http://dx.doi.org/10.2465/jmps.99.298.

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3

Santosh, M., Toshiaki Tsunogae, and Saori Koshimoto. "First Report of Sapphirine-bearing Rocks from the Palghat-Cauvery Shear Zone System, Southern India." Gondwana Research 7, no. 2 (April 2004): 620–26. http://dx.doi.org/10.1016/s1342-937x(05)70813-3.

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4

Lasitha, S., D. Twinkle, P. John Kurian, and P. R. Harikrishnan. "Geophysical evidence for marine prolongation of the Palghat-Cauvery shear system into the offshore Cauvery basin, Eastern continental margin of India." Journal of Asian Earth Sciences 184 (October 2019): 103981. http://dx.doi.org/10.1016/j.jseaes.2019.103981.

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5

TSUNOGAE, Toshiaki, M. SANTOSH, and Makoto SHIMPO. "Sodicgedrite in ultrahigh-temperature Mg-Al-rich rocks from the Palghat-Cauvery Shear Zone system, southern India." Journal of Mineralogical and Petrological Sciences 102, no. 1 (2007): 39–43. http://dx.doi.org/10.2465/jmps.060824.

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6

Collins, Alan S., Chris Clark, K. Sajeev, M. Santosh, David E. Kelsey, and Martin Hand. "Passage through India: the Mozambique Ocean suture, high-pressure granulites and the Palghat-Cauvery shear zone system." Terra Nova 19, no. 2 (April 2007): 141–47. http://dx.doi.org/10.1111/j.1365-3121.2007.00729.x.

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7

NISHIMIYA, Yuki, Toshiaki TSUNOGAE, and M. SANTOSH. "Petrology and fluid inclusions of garnet-clinopyroxene rocks from Paramati in the Palghat-Cauvery Shear Zone System, southern India." Journal of Mineralogical and Petrological Sciences 103, no. 5 (2008): 354–60. http://dx.doi.org/10.2465/jmps.080617.

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8

Collins, Alan S., M. Santosh, Louise Kropinski, Martin P. Hand, Clark Chris, K. Saieev, Stacey McKenzie, and Peter D. Kinny. "The Mozambique Ocean Suture in Southern India: Age and Significance of Granulites in the Palghat-Cauvery Shear Zone System." ASEG Extended Abstracts 2006, no. 1 (December 2006): 1–3. http://dx.doi.org/10.1071/aseg2006ab027.

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9

Tsunogae, T., and M. Santosh. "Ti-free högbomite in spinel- and sapphirine-bearing Mg-Al rock from the Palghat-Cauvery shear zone system, southern India." Mineralogical Magazine 69, no. 6 (December 2005): 937–49. http://dx.doi.org/10.1180/0026461056960300.

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Анотація:

AbstractWe report a new type of högbomite in a spinel- and sapphirine-bearing silica-deficient Mg-Al rock from Manavadi at the northern margin of the Madurai Block along the Palghat-Cauvery shear zone system, which defines the Archaean-Proterozoic collisional boundary in southern India. Högbomite occurs here as fine- to medium-grained euhedral to subhedral crystals enclosed within or along grain boundaries of greenish spinel. It is compositionally very unique due to the lack of TiO2 (<0.2 wt.%) and enrichment in Al2O3 (66.4—70.8 wt.%) compared to other occurrences. The variety of högbomite described in this study, confirmed by laser Raman spectroscopy, has not been reported elsewhere previously. Högbomite in this study is subdivided into three groups based on the XMg (=Mg/ (FeTotal+Mg)) ratio; 0.54—0.57, 0.61—0.73 and 0.77—0.79. Compositional data suggest a linear element substitution of 3(Fe+Mg) = 2Al for the Ti-free högbomite, a trend that is distinct from previously reported Ti-bearing högbomites. Textures and mineral chemistry data suggest that the following reaction took place at retrograde stage (T <800°C): spinel + H2O + O2 → högbomite + corundum + magnetite, implying that introduction of hydrous and oxidized fluid as well as low bulk-Ti content played an important role in the formation of Ti-free högbomite.

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10

Clark, Chris, Alan S. Collins, M. Santosh, Richard Taylor, and Benjamin P. Wade. "The P-T-t architecture of a Gondwanan suture: REE, U–Pb and Ti-in-zircon thermometric constraints from the Palghat Cauvery shear system, South India." Precambrian Research 174, no. 1-2 (October 2009): 129–44. http://dx.doi.org/10.1016/j.precamres.2009.07.003.

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11

Choudhary, A. K., N. B. W. Harris, P. van Calsteren, and C. J. Hawkesworth. "Pan-African charnockite formation in Kerala, South India." Geological Magazine 129, no. 3 (May 1992): 257–64. http://dx.doi.org/10.1017/s0016756800019208.

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Анотація:

AbstractSm-Nd mineral ages of gneisses and associated granulites from the Ponmudi incipient charnockite locality (South India) indicate that granulite metamorphism occurred at, or shortly after, 558 Ma. Proterozoic ages recorded by garnet separates reflect a detrital age or an earlier metamorphic event preserved by inclusions within garnet. The age of post-metamorphic uplift (440–460 Ma) is constrained by Sr isotope equilibration between biotite and plagioclase. Since charnockite formation and subsequent uplift north of the Palghat-Cauvery shear zone had terminated by earliest Proterozoic time, these results confirm two distinct periods of granulite formation in South India and suggest that the Palghat-Cauvery shear zone represents the boundary between two blocks of strongly contrasting geological histories. Both incipient charnockite formation and subsequent uplift at Ponmudi may be correlated with the tectonothermal evolution of the Highlands Group in Sri Lanka. The similarity between Nd and Sr model ages for charnockites and gneisses from Ponmudi indicates that no significant Rb-Sr fractionation has occurred during the crustal history of these incipient charnockites. Pb isotopic ratios suggest that Th-U ratios were fractionated during charnockite formation at about 500 Ma. In contrast to charnockites found north of the Palghat-Cauvery shear zone, fractionation of U-Pb during the Archaean did not occur in the Ponmudi granulites.

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12

Choudhary, A. K., A. K. Jain, Sandeep Singh, Rm Manickavasagam, and K. Chandra. "Crustal accretion and metamorphism of Mesoarchean granulites in Palghat-Cauvery Shear Zone, Southern India." Journal of the Geological Society of India 77, no. 3 (March 2011): 227–38. http://dx.doi.org/10.1007/s12594-011-0029-0.

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13

Manickavasagam, R. M., A. K. Jain, J. Devaraju, J. Sahoo, and Sandeep Singh. "Tectonometamorphic Evolution of Moyar, Bhavani and Palghat-Cauvery Shear Zones of Southern Granulite Terrane, India." Gondwana Research 4, no. 4 (October 2001): 697. http://dx.doi.org/10.1016/s1342-937x(05)70495-0.

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14

Janardhan, A. S. "Southern Granulite Terrain, South of the Palghat-Cauvery Shear Zone: Implications for India-Madagascar Connection." Gondwana Research 2, no. 3 (July 1999): 463–69. http://dx.doi.org/10.1016/s1342-937x(05)70284-7.

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15

Unnikrishnan-Warrier, C., M. Santosh, and M. Yoshida. "First report of Pan-African Sm—Nd and Rb—Sr mineral isochron ages from regional charnockites of southern India." Geological Magazine 132, no. 3 (May 1995): 253–60. http://dx.doi.org/10.1017/s0016756800013583.

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AbstractMineral and whole-rock isotope data for a massive charnockite from Kottaram in the Nagercoil Block at the southern tip of Peninsular India yield Sm—Nd and Rb—Sr ages of 517 ± 26 Ma and 484 ± 15 Ma respectively. The Nd model age calculated for the charnockite is c. 2100 Ma. Our study reports the first Pan-African mineral isochron ages from regional charnockites of Peninsular India, which are in good agreement with the recently obtained ages of incipient charnockites in the adjacent blocks, as well as alkaline plutons within the same block. Our results indicate that the Pan-African tectonothermal event in the granulite blocks south of the Palghat—Cauvery shear zone was regional, with terrain-wide rejuvenation. These results correlate with similar Pan-African tectono-thermal events reported from Sri Lanka and East Antarctica, and have an important bearing on Gondwana reconstructions.

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16

Harris, Nigel. "The Significance of the Palghat-Cauvery Shear Zone in Southern India for Correlations between South-West India and Eastern Madagascar." Gondwana Research 2, no. 3 (July 1999): 471–72. http://dx.doi.org/10.1016/s1342-937x(05)70285-9.

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17

Banerjee, Meenakshi, Upama Dutta, R. Anand, and Zachary D. Atlas. "Insights on the process of two-stage coronae formation at olivine-plagioclase contact in mafic dyke from Palghat Cauvery Shear Zone, southern India." Mineralogy and Petrology 113, no. 5 (June 29, 2019): 625–49. http://dx.doi.org/10.1007/s00710-019-00674-y.

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18

Prathigadapa, Raju, Subrata Das Sharma, and Durbha Sai Ramesh. "Seismic Evidence for Proterozoic Collisional Episodes along Two Geosutures within the Southern Granulite Province of India." Lithosphere 2020, no. 1 (October 15, 2020): 1–20. http://dx.doi.org/10.2113/2020/8861007.

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Abstract The Southern Granulite Province of India had witnessed episodes of multiple tectonic activities, leading to sparsely preserved surface geological features. The present study is focused on unraveling the geodynamic evolution of this terrain through measurement of Moho depth and Vp/Vs ratio using data from a large number of broadband seismic stations. These results unambiguously establish three domains distinct in Moho depth and crustal composition. An intermediate to felsic crust with a 7–10 km step-in-Moho is delineated across the Moyar–Bhavani region. Anomalously high felsic crust with abrupt jump in Moho (~8–10 km) together with a dipping feature at deeper level characterizes the transition from eastern to southern segments of the Jhavadi–Kambam–Trichur region. By contrast, the central zone hosting the Palghat–Cauvery shear zone records uniform felsic crust and flat Moho. Drawing analogy from similar results in different parts of the globe, juxtaposition of petrologically dissimilar crustal blocks characterized by varied depths to the Moho is argued to point towards unambiguous presence of two distinct geosutures in the study area: one along the Moyar–Bhavani region and the other across the Jhavadi–Kambam–Trichur. This inference is corroborated by the presence of layered meta-anorthosite, related rock suites, and mafic-ultramafic bodies, supporting the view of a suprasubduction setting in the Moyar–Bhavani region. The Jhavadi–Kambam–Trichur area is marked by operation of the Wilson cycle by way of sparsely preserved geological features such as the presence of ophirags (ophiolite fragments), alkali syenites, and carbonatites. Geochronological results suggest that the suturing along Moyar–Bhavani took place during the Paleoproterozoic and that along Jhavadi–Kambam–Trichur was during the late Neoproterozoic.

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19

Bhaskar Rao, Y. J., S. P. Kelley, N. B. W. Harris, B. L. Narayana, and C. Srikantappa. "An 40Ar–39Ar laser-probe study of pseudotachylites in charnockite gneisses from the Cauvery Shear Zone system, South India." Gondwana Research 10, no. 3-4 (November 2006): 357–62. http://dx.doi.org/10.1016/j.gr.2006.02.005.

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20

Rao, V. Vijaya, and B. Rajendra Prasad. "Structure and evolution of the Cauvery Shear Zone system, Southern Granulite Terrain, India: Evidence from deep seismic and other geophysical studies." Gondwana Research 10, no. 1-2 (August 2006): 29–40. http://dx.doi.org/10.1016/j.gr.2005.11.012.

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21

Ganguli, Shuva Shankha, Sanjit Kumar Pal, Sant Lal Singh, Jammi Venkata Rama Rao, and Beechani Balakrishna. "Insights into crustal architecture and tectonics across Palghat Cauvery Shear Zone, India from combined analysis of gravity and magnetic data." Geological Journal, December 4, 2020. http://dx.doi.org/10.1002/gj.4041.

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22

Chatterjee, Amitava, Chang Whan Oh, Byung Choon Lee, Kaushik Das, and Hiroshi Hidaka. "Metamorphic evolution of the Sittampundi Layered Complex, India, during the Archaean–Proterozoic boundary: insight from pseudosection modelling and zircon U–Pb SHRIMP geochronology." Geological Magazine, May 26, 2022, 1–29. http://dx.doi.org/10.1017/s0016756822000164.

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Анотація:

Abstract In the Palghat–Cauvery Shear/Suture Zone of the Southern Granulite Terrane, the Sittampundi Layered Complex occurs as a mappable unit. The Sittampundi Layered Complex consists of mafic, ultramafic and anorthositic rocks with chromitite layers and has been interpreted as an arc/ophiolite complex that formed in an Archaean suprasubduction zone arc setting. In the Sittampundi Layered Complex, reddish-black metabasites occur as layers or boudins with a rim of amphibolite within anorthosite. The peak metamorphic assemblage of the metabasites is garnet + clinopyroxene + quartz + rutile ± plagioclase ± orthopyroxene, and symplectite consisting of amphibole and plagioclase formed around the garnet during retrograde metamorphism. The protolith of metabasite may have intruded in a suprasubduction zone arc setting during the late Neoarchaean (c. 2540–2520 Ma), and then underwent high-pressure granulite-facies peak metamorphism (900–800 °C and 11–14 kbar) in the early Palaeoproterozoic (c. 2460–2440 Ma), followed by amphibolite-facies metamorphism (550–480 °C and 5.5–4.5 kbar) in the middle Palaeoproterozoic (c. 1900–1850 Ma). The results obtained in this study, together with previous studies, indicate that: (1) the high-pressure granulite-facies metamorphism in the study area indicates that subduction occurred during the Archaean–Proterozoic boundary with a higher apparent average geothermal gradient (∼20–16 °C km−1) than the modern-day Earth, and (2) the apparent average geothermal gradient of the subduction zone was ∼29–14 °C km−1 during the Archaean–Proterozoic boundary, which was still too high to enter the realm of eclogite-facies metamorphism.

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