Structure, kinematics and ages of transpression during strain-partitioning in the Chongshan shear zone, western Yunnan, China
Structure, kinematics and ages of transpression during strain-partitioning in the Chongshan shear zone, western Yunnan, China
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滇西崇山剪切带应变分区过程中的变形结构、运动学及时代
DOI：
10.1016/j.jsg.2010.02.001
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发表时间：
2010-04
影响因子：
3.1
通讯作者：
Zhang Bo, Zhang Jinjiang, Zhong Dalai, Guo Lei
中科院分区：
文献类型：
--
作者：
Zhang Bo, Zhang Jinjiang, Zhong Dalai, Guo Lei
崇山剪切带从东喜马拉雅构造槽延伸至云南临沧花岗岩体。构造和运动学分析表明，剪切带主要由糜棱质片麻岩-混辉岩和片岩组成，北南北向段以右旋走滑运动为主，中南向段以北西-东南向左旋走滑剪切为主。两者都是在区域尺度的大规模左旋坳陷下发育的。SHRIMP和LA-ICPMS U-Pb和40ar /39Ar测年揭示了该区两次第三纪岩浆活动，随后发生了更年轻的左旋走滑剪切。在走滑运动之前，始新世岩浆活动（c. 55 ~ 38ma）和变质作用（c. 36Ma）先后发生。沿带的走滑剪切始于c. 32Ma，产生了32 ~ 22Ma的剪切加热。同动云母的40ar /39Ar年龄在19 ~ 14Ma之间，表明走滑剪切作用持续到这一时期，并伴有同时期的逆挤压掘出和比螺雪山—崇山链变质岩的隆升。崇山带是一个新生代剪切带，与哀牢山—红河剪切带和高黎贡剪切带的左旋运动同时发生，在碰撞过程中对印度板块的北移起到重要作用。渐新世至中新世，挤压在哀牢山-红河和高黎贡剪切带之间的大陆块体，被崇山剪切带至少肢解成两大块。
The Chongshan shear zone extends from the eastern Himalayan Syntaxis to the Lincang Granitic pluton in Yunnan Province, China. The structure and kinematics show that the shear zone comprises mainly of mylonitic gneiss–migmatite and schist with a dextral-dominated strike-slip motion in an N–S trending northern segment, and a sinistral strike-slip shear in NW–SE trending middle and southern segments. Both were developed under a bulk, regional-scale sinistral transpression. SHRIMP and LA-ICPMS U–Pb and40Ar/39Ar dating reveal two Tertiary magmatic events along the zone, followed by younger sinistral strike-slip shear. The Eocene magmatic event (c. 55–38Ma), followed by metamorphism at c. 36Ma, happened before the strike-slip motion. The strike-slip shear along the zone began c. 32Ma, which generated shear heating from 32 to 22Ma. The40Ar/39Ar ages of syn-kinematic micas, range from 19 to 14Ma, and indicate that the strike-slip shear continued to this time with coeval transpressional exhumation and uplift of the metamorphic rocks along the Biluoxueshan–Chongshan chain. The Chongshan zone is thus a Cenozoic shear zone, which was contemporaneous with motion on the left-lateral Ailao Shan-Red River shear zone and the right-lateral Gaoligong shear zone, and should be important in accommodating the northwards movement of India during collision. During Oligocene to Miocene times, the continental block that was extruded between the Ailao Shan-Red River and Gaoligong shear zones was dismembered into at least two major fragments by the Chongshan shear zone.
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影响因子：
3
作者：
Te-Hsien Lin;C. Lo;Sun‐Lin Chung;Fang Jui Hsu;M. Yeh;T. Lee;J. Ji;Y. Wang;Dunyi Liu
通讯作者：
Te-Hsien Lin;C. Lo;Sun‐Lin Chung;Fang Jui Hsu;M. Yeh;T. Lee;J. Ji;Y. Wang;Dunyi Liu
DOI：
10.1144/gsl.sp.1998.135.01.04
发表时间：
1998
期刊：
Geological Society, London, Special Publications
影响因子：
--
作者：
Shoufa Lin;D. Jiang;P. Williams
通讯作者：
Shoufa Lin;D. Jiang;P. Williams
DOI：
10.1144/gsl.sp.1989.043.01.02
发表时间：
1989
期刊：
Geological Society, London, Special Publications
影响因子：
--
作者：
E. Essene
通讯作者：
E. Essene
DOI：
10.1016/0743-9547(89)90031-7
发表时间：
1989
期刊：
Journal of Southeast Asian Earth Sciences
影响因子：
--
作者：
L. Changshi;Zhu Jinchu;Xu Xisheng;Cai Dekun;Y. Pin
通讯作者：
L. Changshi;Zhu Jinchu;Xu Xisheng;Cai Dekun;Y. Pin
影响因子：
3.5
作者：
G. Vavra;R. Schmid;D. Gebauer
通讯作者：
G. Vavra;R. Schmid;D. Gebauer