Petrological Characteristics of Triassic Magmatic Rocks from the Conjunction of Qinling, Qilian and Kunlun Orogens and Their Tectonic Environment(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2015年第06期
- Page:
- 72-81
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Petrological Characteristics of Triassic Magmatic Rocks from the Conjunction of Qinling, Qilian and Kunlun Orogens and Their Tectonic Environment
- Author(s):
- XIE Xiao-long; NIU Man-lan; WU Qi; YAN Zhen; LI Xiu-cai; XIA Wen-jing; FU Chang-lei
- 1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China; 2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
- Keywords:
- petrology; Triassic; magmatic rock; tectonic environment; continental margin arc; Palaeo-Tethys ocean; post-collision; the conjunction of Qinling; Qilian and Kunlun orogens
- PACS:
- P588.1
- DOI:
- -
- Abstract:
- Triassic magmatic rocks widely develop in the conjunction of Qinling, Qilian and Kunlun orogens along Nanshan fault, Wahongshan fault and Duohemao fault in Qinghai with a NW-SE-trending. The types of rocks are complicated and various, including volcanic and intrusive rocks. Volcanic rocks consist of basalt, andesite, dacite, rhyolite and volcanic breccias; intrusive rocks consist of gabbro, diorite, granodiorite, granite and quartz porphyry, etc. Isotopic chronology research reveals that the forming ages of these Triassic igneous rocks are mostly concentrated in Early-Middle Triassic (233-253 Ma) and Late Triassic (205-225 Ma), and gradually decreased from NW to SE. Geochemistry characteristics and rock assemblages suggest that the Early-Middle Triassic magmatic rocks in the conjunction of Qinling, Qilian and Kunlun orogens are formed in continental margin arc setting by the northern subduction of Palaeo-Tethys ocean; however, the Late Triassic magmatic rocks are formed in post-collisional stage.
Last Update: 2015-11-27