Mega sheath fold of the Mahadevi hills, Cauvery Suture Zone, southern India: Implication for accretionary tectonics

被引：15
|
作者：
Chetty, T. R. K. [1 ]
Yellappa, T. [1 ]
Mohanty, D. P. [1 ]
Nagesh, P. [1 ]
Sivappa, V. V. [1 ]
Santosh, M. [2 ]
Tsunogae, T. [3 ]
机构：
[1] Natl Geophys Res Inst CSIR, Hyderabad 500007, Andhra Pradesh, India
[2] Kochi Univ, Kochi, Japan
[3] Univ Tsukuba, Tsukuba, Ibaraki 305, Japan
来源：
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA | 2012年 / 80卷 / 06期
关键词：
Mega Sheath fold; Cauvery Suture Zone; Mahadevi; Subduction; Accretion; Granulites; Tamil Nadu; ULTRAHIGH-TEMPERATURE METAMORPHISM; GRANULITE TERRAIN; HIGH-PRESSURE; STRUCTURAL-ANALYSIS; MADURAI BLOCK; DEFORMATION; SUBDUCTION; EVOLUTION; HISTORY; MOUNTAINS;
D O I：
10.1007/s12594-012-0205-x
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
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.
引用
收藏
页码：747 / 758
页数：12
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