气候变化领域集成服务门户(CCPortal): Tectonic transformation from orogen-perpendicular to orogen-parallel extension in the North Himalayan Gneiss Domes: Evidence from a structural, kinematic, and geochronological investigation of the Ramba gneiss dome

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DOI	10.1016/j.jsg.2022.104527
	Tectonic transformation from orogen-perpendicular to orogen-parallel extension in the North Himalayan Gneiss Domes: Evidence from a structural, kinematic, and geochronological investigation of the Ramba gneiss dome
	Chen, Siyu; Zhang, Bo; Zhang, Jinjiang; Wang, Yang; Li, Xiaorong; Zhang, Lei; Yan, Yan; Cai, Fulong; Yue, Yahui
通讯作者	Zhang, B (通讯作者)
发表日期	2022
ISSN	0191-8141
EISSN	1873-1201
卷号	155
英文摘要	The North Himalayan Gneiss Domes consist of a series of isolated domes cored by leucogranite and/or gneiss body. The Ramba dome core comprises gneiss and two-mica granite, mantled mainly by schist sequences, and the degree of deformation decreases outward from pervasive mylonitization to weak mylonitization. Pre-doming deformation is characterized by the formation of regional-scale top-to-the-north shearing (D1) in the Tethyan Himalayan Sequence, locally preserved strong folding (F1), and intrusion of 46.3 Ma-40.6 Ma leucogranite. The D2 deformation consists of map-scale ductile shearing fabrics and top-to-the-north detachment along the South Tibetan Detachment System (STDS) in the middle and lower units of the dome. Intrusion of 26.1-21.0 Ma synkinematic leucogranite veins in the schist units occurred during the D2 north-directed extensional episode. The D3 deformation was characterized by top-to-the-east shear during 12.0-10.2 Ma, concurrent with the initiation of activity in the N-S-trending Yadong-Gulu rift. The latest deformation (D4) involved the ascent of two-mica leucogranite through diapirism at about 8.17 Ma. Microstructural analyses, as well as quartz c-axis fabrics measured by EBSD (Electron backscatter diffraction), indicate deformation temperature ranges of D2 extensional shearing from 500 to 600 degrees C in the middle unit of the Ramba dome to >600 degrees C in the lower unit. These new data imply that this type of doming in the Ramba region represents a classic type of transformation from orogenperpendicular to orogen-parallel extensional deformation during Miocene India-Asia collision.
关键词	OBLIQUELY CONVERGENT REGIME E-W EXTENSION SOUTHERN TIBET CENOZOIC TECTONICS DETACHMENT SYSTEM TETHYAN HIMALAYA MALASHAN DOME KANGMAR DOME N-S EVOLUTION
英文关键词	North himalayan gneiss domes; South Tibetan detachment system; Ramba dome; North-directed detachment; East-directed shear; Leucogranite diapirism
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000782125100001
来源期刊	JOURNAL OF STRUCTURAL GEOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260661
推荐引用方式 GB/T 7714	Chen, Siyu,Zhang, Bo,Zhang, Jinjiang,et al. Tectonic transformation from orogen-perpendicular to orogen-parallel extension in the North Himalayan Gneiss Domes: Evidence from a structural, kinematic, and geochronological investigation of the Ramba gneiss dome[J]. 中国科学院青藏高原研究所,2022,155.
APA	Chen, Siyu.,Zhang, Bo.,Zhang, Jinjiang.,Wang, Yang.,Li, Xiaorong.,...&Yue, Yahui.(2022).Tectonic transformation from orogen-perpendicular to orogen-parallel extension in the North Himalayan Gneiss Domes: Evidence from a structural, kinematic, and geochronological investigation of the Ramba gneiss dome.JOURNAL OF STRUCTURAL GEOLOGY,155.
MLA	Chen, Siyu,et al."Tectonic transformation from orogen-perpendicular to orogen-parallel extension in the North Himalayan Gneiss Domes: Evidence from a structural, kinematic, and geochronological investigation of the Ramba gneiss dome".JOURNAL OF STRUCTURAL GEOLOGY 155(2022).