Mega sheath fold of the Mahadevi hills, Cauvery Suture Zone, southern India: Implication for accretionary tectonics
Mega sheath fold of the Mahadevi hills, Cauvery Suture Zone, southern India: Implication for accretionary tectonics
复制标题
DOI：
10.1007/s12594-012-0205-x
复制
发表时间：
2012-12
影响因子：
1.3
通讯作者：
T. Chetty;T. Yellappa;D. Mohanty;P. Nagesh;V. V. Sivappa-V.;M. Santosh;T. Tsunogae
中科院分区：
文献类型：
--
作者：
T. Chetty;T. Yellappa;D. Mohanty;P. Nagesh;V. V. Sivappa-V.;M. Santosh;T. Tsunogae
Mahadevi山丘位于Cauvery缝合带的轴向地带，由一系列麻粒岩相岩石组成，以含石榴子石的辉石麻粒岩和石英-英辉片麻岩为代表，与带状铁地层交错。手持GPS构造图显示，Mahadevi丘陵构成了一个大型鞘褶皱构造，暴露出发育良好的向东倾伏伸展线理。凹陷和顶点表面与椭圆形的地图图案有很好的分界。大型鞘状褶皱构造的发育与区域逆冲推覆构造有成因联系，支持Cauvery缝合带演化的俯冲-增生-碰撞历史模式。
The Mahadevi hills, located in the axial zone of Cauvery Suture Zone, comprise a sequence of granulite facies rocks represented by garnet-bearing pyroxene granulites and quartzo-feldspathic gneisess interfolded with banded iron formations. Structural mapping with hand held GPS reveals that the Mahadevi hills constitute a mega sheath fold structure exposing well developed easterly plunging extension lineations. Depressional and culmination surfaces are well demarcated in association with elliptical map patterns. The development of the mega sheath fold structure is genetically related to the regional thrust-nappe tectonics, supporting the model of subduction-accretion-collisional history for the evolution of the Cauvery Suture Zone.