Beach placers of southwestern India: An archive of Precambrian supercontinent growth histories
文献类型：期刊论文
| 作者 | Athira, P. G.4,5; Sajeev, K.5; Dunkley, Daniel J.2; George, P. M.1; Zhai, Mingguo3; Zhou, Ligang3; Ayisha, V. A.4 |
| 刊名 | PRECAMBRIAN RESEARCH
 |
| 出版日期 | 2021-09-15 |
| 卷号 | 364页码:22 |
| 关键词 | Beach placers southern India Zircon Monazite U-Pb geochronology Provenance |
| ISSN号 | 0301-9268 |
| DOI | 10.1016/j.precamres.2021.106342 |
| 英文摘要 | The southwestern coast of India is known for its rich beach placer deposits. So far, there have been no substantial attempts to determine the provenance of these deposits on a regional scale. Here we present for the first time geochronology, trace element chemistry and Hf isotope systematics of zircon and monazite from representative beach placer deposits along the southwestern coast of India to constrain provenance. Detrital zircon grains display a wide variety of ages, with modes in the ranges of 650-450 Ma, 1100-650 Ma, 2300-1600 Ma, 2800-2300 Ma and 3500-2800 Ma. A high proportion of ages fall within the Neoproterozoic-Late Cambrian range (1066-490 Ma). Growth zoning in zircon grains shows magmatic growth of many generations with ages affected by Neoproterozoic Pb loss, along with overgrowths typical of those formed during high-T metamorphism. Grains of metamorphic zircon, along with grains of monazite from the same samples of sediment, have strong modes between 570 and 470 Ma, indicating derivation from sources in the Southern Granulite Terrane affected by a major Late Neoproterozoic to Cambrian tectonothermal event. Mineral geochemistry of zircon grains indicates continental derivation, especially with older zircon from TTG-type sources. The geochemistry of late Neoproterozoic-Cambrian zircon and monazite are consistent with derivation from amphibolite to granulite-facies source rocks. Zircon ages and Hf isotope systematics can be ascribed to provenance from various source terranes exposed along the Western Ghats. This young rift-flank escarpment formed along the coast at a high angle to the distribution of different Precambrian terranes in the Indian Peninsula. Erosion promoted by a tropical climate and a steep coastal geomorphology, in combination with strong southward along-shore ocean currents, led to the concentration and distribution of heavy minerals from multiple sources along southwestern coast of India. The relative intensity of age modes in detrital zircon differs between localities, demonstrating differing inputs from proximal sources (from rivers dissecting steep terrain) versus distal sources from more northerly cratons and terranes brought to deposition sites by along-shore drift. |
| WOS关键词 | ZIRCON U-PB ; SOUTHERN GRANULITE TERRANE ; KERALA KHONDALITE BELT ; ULTRAHIGH-TEMPERATURE METAMORPHISM ; HIGH-PRESSURE METAMORPHISM ; HF ISOTOPIC SYSTEMATICS ; HIGH-GRADE METAMORPHISM ; WESTERN DHARWAR CRATON ; LA-ICP-MS ; TRACE-ELEMENT |
| 资助项目 | Chinese Academy of Sciences[XDB 18030205] ; Indo-Sri-Lankan bilateral Research project under Department of Science and Technology, India[DSTO/CEAS/SJK/1802] ; Ministry of Science, Technology and Research, Sri Lanka[MTR/TRD/AGR/3/2/20] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000695141600007 |
| 出版者 | ELSEVIER |
| 资助机构 | Chinese Academy of Sciences ; Chinese Academy of Sciences ; Indo-Sri-Lankan bilateral Research project under Department of Science and Technology, India ; Indo-Sri-Lankan bilateral Research project under Department of Science and Technology, India ; Ministry of Science, Technology and Research, Sri Lanka ; Ministry of Science, Technology and Research, Sri Lanka ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Indo-Sri-Lankan bilateral Research project under Department of Science and Technology, India ; Indo-Sri-Lankan bilateral Research project under Department of Science and Technology, India ; Ministry of Science, Technology and Research, Sri Lanka ; Ministry of Science, Technology and Research, Sri Lanka ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Indo-Sri-Lankan bilateral Research project under Department of Science and Technology, India ; Indo-Sri-Lankan bilateral Research project under Department of Science and Technology, India ; Ministry of Science, Technology and Research, Sri Lanka ; Ministry of Science, Technology and Research, Sri Lanka ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Indo-Sri-Lankan bilateral Research project under Department of Science and Technology, India ; Indo-Sri-Lankan bilateral Research project under Department of Science and Technology, India ; Ministry of Science, Technology and Research, Sri Lanka ; Ministry of Science, Technology and Research, Sri Lanka |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/102660]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Sajeev, K. |
| 作者单位 | 1.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 2.Polish Acad Sci, Inst Geophys, Dept Polar & Marine Res, Warsaw, Poland 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 4.MES Ponnani Coll, Dept PG Studies & Res Geol, Ponnani 679586, India 5.Indian Inst Sci, Ctr Earth Sci, Bengaluru 560012, India |
| 推荐引用方式 GB/T 7714 | Athira, P. G.,Sajeev, K.,Dunkley, Daniel J.,et al. Beach placers of southwestern India: An archive of Precambrian supercontinent growth histories[J]. PRECAMBRIAN RESEARCH,2021,364:22. |
| APA | Athira, P. G..,Sajeev, K..,Dunkley, Daniel J..,George, P. M..,Zhai, Mingguo.,...&Ayisha, V. A..(2021).Beach placers of southwestern India: An archive of Precambrian supercontinent growth histories.PRECAMBRIAN RESEARCH,364,22. |
| MLA | Athira, P. G.,et al."Beach placers of southwestern India: An archive of Precambrian supercontinent growth histories".PRECAMBRIAN RESEARCH 364(2021):22. |
入库方式： OAI收割
来源：地质与地球物理研究所
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