Strain localization along the Atlantis Bank oceanic detachment fault system, Southwest Indian Ridge
Strain localization along the Atlantis Bank oceanic detachment fault system, Southwest Indian Ridge
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西南印度洋中脊亚特兰蒂斯浅滩洋拆离断层系统沿线的应变局部化
DOI：
10.1029/2009gc002646
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发表时间：
2010
期刊：
影响因子：
3.7
通讯作者：
B. John
中科院分区：
文献类型：
--
作者：
E. Miranda;B. John
显微结构观察和矿物测温原位样品收集的亚特兰蒂斯银行的海洋核心复杂（西南印度洋脊）表明，剥离断层的超固相线条件下，在韧性制度，并继续通过亚绿片岩温度通过韧性，半脆性和脆性制度应变本地化沿着暴露，现在近水平的断层表面。韧性、半脆性和脆性组构发育于以辉长岩为主的岩石中。下盘岩石表现出结晶塑性织物分布在结构厚度高达400米以下裸露的断层面暴露在海底，而半脆性和脆性织物集中在80和30米以下的主要滑面的剥离断层，分别。样品组构表明，应变局部化是通过斜长石在910°C至650 °C之间的动态重结晶、角闪石调节的溶解沉淀蠕变、角闪石调节的反应软化和脆性断裂实现的。
Microstructural observations and mineral thermometry from in situ samples collected from the Atlantis Bank oceanic core complex (SW Indian Ridge) indicate that detachment faulting was initiated under hypersolidus conditions in the ductile regime and continued through subgreenschist temperatures through the ductile, semibrittle, and brittle regimes as strain localized along the exposed, now subhorizontal fault surface. Ductile, semibrittle, and brittle fabrics are developed within dominantly gabbroic rocks. Footwall rocks exhibit crystal plastic fabrics distributed over a structural thickness up to 400 m below the denuded fault surface exposed at the seafloor, whereas semibrittle and brittle fabrics are concentrated in the 80 and 30 m immediately below the principal slip surface of the detachment fault, respectively. Sample fabrics suggest that strain localization was achieved by dynamic recrystallization of plagioclase at temperatures between 910°C and 650°C, by amphibole‐accommodated dissolution‐precipitation creep at temperatures ∼750°C–450°C, by chlorite‐accommodated reaction softening at temperatures ∼450°C–300°C, and by brittle fracturing and cataclasis at temperatures <300°C.
影响因子：
5.8
作者：
McCaig, Andrew M.;Cliff, Robert A.;MacLeod, Christopher J.
通讯作者：
MacLeod, Christopher J.