Geochemistry of the ophiolite and oceanic island basalt in the Kangxian-Pipasi-Nanping tectonic mélange zone, South Qinling and their tectonic significance  

Geochemistry of the ophiolite and oceanic island basalt in the Kangxian-Pipasi-Nanping tectonic melange zone, South Qinling and their tectonic significance

作　　者：LAI Shaocong ZHANG Guowei PEI Xianzhi YANG Haifeng 

机构地区：[1]Key Laboratory of Continental Dynamics, Ministry of Education and Department of Geology, Northwest University, Xi'an 710069, China

出　　处：《Science China Earth Sciences》2004年第2期128-137,共10页中国科学(地球科学英文版)

基　　金：This work was jointly supported by the Foundation for University Key Teacher of the Ministry of Education ; the National Natural Science Foundation of China (Grant No.49732080) ; the Special Science Foundation of Shaanxi Province.

摘　　要：Detailed studies indicate that Kangxian-Pipasi-Nanping tectonic zone is a complicated mélange zone which includes many tectonic slabs of different origins. Ophiolite (MORB-type basalt), oceanic island tholeiite and alkaline basalt have been identified. Moreover, this tectonic mélange zone is eastward connected with the Mianlüe suture zone. The deformation characteristics, consisting components and volcanic rock geochemical features for the Kangxian-Pipasi-Nanping tectonic mélange zone are much similar to those of the Mianlüe suture zone and Deerni ophiolite. Therefore, the Kangxian-Pipasi-Nanping tectonic mélange zone should be the westward extension part of the Mianlüe suture zone. It indicates that the Mianlüe suture zone had extended to the Nanping area.Detailed studies indicate that Kangxian-Pipasi-Nanping tectonic zone is a complicated mélange zone which includes many tectonic slabs of different origins. Ophiolite (MORB-type basalt), oceanic island tholeiite and alkaline basalt have been identified. Moreover, this tectonic mélange zone is eastward connected with the Mianlüe suture zone. The deformation characteristics, consisting components and volcanic rock geochemical features for the Kangxian-Pipasi-Nanping tectonic mélange zone are much similar to those of the Mianlüe suture zone and Deerni ophiolite. Therefore, the Kangxian-Pipasi-Nanping tectonic mélange zone should be the westward extension part of the Mianlüe suture zone. It indicates that the Mianlüe suture zone had extended to the Nanping area.

关 键 词：ophiolite and volcanic rock GEOCHEMISTRY tectonic settings Kangxian-Pipasi-Nanping Mianlüe suture zone 

分 类 号：P5[天文地球—地质学]