Crustal structure and rift tectonics across the Cauvery–Palar basin, Eastern Continental Margin of India based on seismic and potential field modelling
| العنوان: | Crustal structure and rift tectonics across the Cauvery–Palar basin, Eastern Continental Margin of India based on seismic and potential field modelling |
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| المؤلفون: | M. Radhakrishna, D. Twinkle, K.S.R. Murthy, G. Srinivasa Rao |
| المصدر: | Journal of Earth System Science. 125:329-342 |
| بيانات النشر: | Springer Science and Business Media LLC, 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | 010504 meteorology & atmospheric sciences, Evolution, Gravity, Seismic, 010502 geochemistry & geophysics, 01 natural sciences, Eastern Continental Margin Of India (Ecmi), Paleontology, Continental margin, Gravity And Magnetic, Magnetic Anomaly Data, Geophysical-Data, Cauvery-Palar Basin, Magnetic anomaly, Coast, 0105 earth and related environmental sciences, Rift, Depth, Pull apart basin, Crust, Curie depth, Aeromagnetic Data, Tectonics, Bay, Crustal Structure, Bengal Fan, Peninsular Shield, General Earth and Planetary Sciences, Basin and range topography, Geology, Seismology |
| الوصف: | The Cauvery-Palar basin is a major peri-cratonic rift basin located along the Eastern Continental Margin of India (ECMI) that had formed during the rift-drift events associated with the breakup of eastern Gondwanaland (mainly India-Sri Lanka-East Antarctica). In the present study, we carry out an integrated analysis of the potential field data across the basin to understand the crustal structure and the associated rift tectonics. The composite-magnetic anomaly map of the basin clearly shows the onshore-to-offshore structural continuity, and presence of several high-low trends related to either intrusive rocks or the faults. The Curie depth estimated from the spectral analysis of offshore magnetic anomaly data gave rise to 23 km in the offshore Cauvery-Palar basin. The 2D gravity and magnetic crustal models indicate several crustal blocks separated by major structures or faults, and the rift-related volcanic intrusive rocks that characterize the basin. The crustal models further reveal that the crust below southeast Indian shield margin is similar to 36 km thick and thins down to as much as 13-16 km in the Ocean Continent Transition (OCT) region and increases to around 19-21 km towards deep oceanic areas of the basin. The faulted Moho geometry with maximum stretching in the Cauvery basin indicates shearing or low angle rifting at the time of breakup between India-Sri Lanka and the East Antarctica. However, the additional stretching observed in the Cauvery basin region could be ascribed to the subsequent rifting of Sri Lanka from India. The abnormal thinning of crust at the OCT is interpreted as the probable zone of emplaced Proto-Oceanic Crust (POC) rocks during the breakup. The derived crustal structure along with other geophysical data further reiterates sheared nature of the southern part of the ECMI. |
| تدمد: | 0973-774X 0253-4126 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::080d3514d09ebe448bf7cde3aa848951 https://doi.org/10.1007/s12040-016-0669-y |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....080d3514d09ebe448bf7cde3aa848951 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 0973774X 02534126 |
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