Transpression and juxtaposition of middle crust over upper crust forming a crustal scale flower structure: Insight from structural, fabric, and kinematic studies from the Rengali Province, eastern India
Transpression and juxtaposition of middle crust over upper crust forming a crustal scale flower structure: Insight from structural, fabric, and kinematic studies from the Rengali Province, eastern India
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中地壳在上地壳上的变形和并置形成了地壳尺度的花状结构：来自印度东部伦格利省的结构、结构和运动学研究的见解
DOI：
10.1016/j.jsg.2015.12.006
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发表时间：
2016
影响因子：
3.1
通讯作者：
J.
中科院分区：
文献类型：
--
作者：
Ghosh;G.;Bose;S.;Das;K.;Arnab Dasgupta;A.;Yamamoto;T.;Hayasaka;Y.;Chakrabarti;K.;and Mukhopadhyay;J.
变形，变质，独居石年龄和组构数据从Rengali省，印度东部汇聚到一个多尺度的压扭变形幕在约。498-521 Ma，这是与最新阶段的构造作用在原印度-南极洲连接。宏微观构造要素相互叠加关系的详细分区研究表明，变形区域划分为褶皱-逆冲为主的缩短带与以逆冲为主的横向变形带交替，北部为逆冲方向的Barkot剪切带，南部为右行走的Kerajang断裂带。应变分带进一步限定在两条区域性横向剪切带之间，即西部的左旋Riedel剪切带和东部的右旋Akul断裂带，它们分别被解释为合成R和反向R' Riedel剪切面。整体结构配置已被解释为一个积极的花状结构之间的纵向和横向断层与垂直挤压和对称并列的中地壳角闪岩级基底片麻岩在低级上地壳岩石从中央轴的挤压带。
Deformational, metamorphic, monazite age and fabric data from Rengali Province, eastern India converge towards a multi-scale transpressional deformational episode at ca. 498–521 Ma which is linked with the latest phase of tectonic processes operative at proto-India-Antarctica join. Detailed sector wise study on mutual overprinting relationships of macro-to microstructural elements suggest that deformation was regionally partitioned into fold-thrust dominated shortening zones alternating with zones of dominant transcurrent deformation bounded between the thrust sense Barkot Shear Zone in the north and the dextral Kerajang Fault Zone in the south. The strain partitioned zones are further restricted between two regional transverse shear zones, the sinistral Riamol Shear Zone in the west and the dextral Akul Fault Zone in the east which are interpreted as synthetic R and antithetic R' Riedel shear plane, respectively. The overall structural disposition has been interpreted as a positive flower structure bounded between the longitudinal and transverse faults with vertical extrusion and symmetric juxtaposition of mid-crustal amphibolite grade basement gneisses over low-grade upper crustal rocks emanating from the central axis of the transpressional belt.