globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2020.228576
论文题名:
Remnant plume head under Neoproterozoic Malani Igneous Suite, western India
作者: Prakash O.; Singh A.P.; Prasad K.N.D.; Rao B.N.; Pandey A.K.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 792
语种: 英语
中文关键词: 3D gravity modelling ; Bouguer anomaly ; Felsic volcanism ; Frequency filtering ; Malani Igneous Suite
英文关键词: Geophysics ; Constrained inversions ; Frequency filtering ; Geophysical observations ; Gravity anomalies ; High-density bodies ; Magma composition ; Magma reservoirs ; Magmatic intrusions ; Physics ; Bouguer anomaly ; forward modeling ; igneous intrusion ; inverse analysis ; magma chamber ; mantle plume ; Moho ; Proterozoic ; India ; Rajasthan
英文摘要: The plumbing architecture of the Neoproterozoic Malani Igneous Suite (MIS), representing one of the largest, intraplate, anorogenic rhyolitic volcanism in western Rajasthan, is poorly constrained. We present a crustal scale model from gravity anomaly modelling also supported by other geological and geophysical observations. The regional-residual separation using frequency filtering technique reveals the presence of high-density discreet bodies at different crustal levels. A 2½D forward and 3D constrained inversion of the residual gravity anomaly suggests the presence of sediments covering MIS, and 6–8 km thick high-density sills emplaced in upper crust down to ~9 km depth. The high gravity anomalies in the remaining part of the Bouguer anomaly could be explained by the presence of 10–12 km thick high-density magmatic intrusion at the base of the Moho below 32–38 km depth. These high-density bodies may be attributed to mafic/ultramafic cumulates during MIS magmatism. It appears that the magmatic melts migrated upwards from the mantle to lower crustal magma reservoirs may alter the bulk magma composition by crustal assimilation. The ensuing density contrast would lead to the upward migration of the dominant felsic melt and their emplacement at shallower depths. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170685
Appears in Collections:气候变化与战略

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作者单位: CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad, 500007, India

Recommended Citation:
Prakash O.,Singh A.P.,Prasad K.N.D.,et al. Remnant plume head under Neoproterozoic Malani Igneous Suite, western India[J]. Tectonophysics,2020-01-01,792
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