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作 者:ZHANG Chuanlin LI Yong YANG Zhihua
机构地区:[1]Department of Earth Sciences,Nanjing University,Nanjing,Jiangsu 210093 [2]Xi'an Engineering College,Xi'an,Shaanxi 710054
出 处:《Acta Geologica Sinica(English Edition)》1998年第2期230-236,共7页地质学报(英文版)
基 金:This study was supported by the National Natural Science Foundation of China grant 49272136, the State Science and Technology Commission Project 96-914-01-04 and the Ministry of Geology and Mineral Resources Shaanxi-Gansu-Sichuan Project 95-02-002-01.
摘 要:Abstract: It was previously considered that all of the Pb-Zn deposits in the Xicheng orefield belong to Devonian hydrothermal-sedimentary deposits or their reworked ones. Study proves that the host strata, besides the Devonian, include the Palaeoproterozoic. The super-large Changba-Lijiagou Pb-Zn deposit occurs in the Palaeoproterozoic strata. The deposits in this district are not hydrothermal-sedimentary deposits or their reworked ones, but Yanshanian-Himalayan epigenetic hydrothermal deposits. The modes of occurrence, sizes and positions of all the deposits in the Xicheng orefield are completely controlled by the choula (draw)-thrust sheet. Therefore the previous grounds for the model of the Qinling-type Pb-Zn deposits cannot hold good. The authors propose that the Changba-type and Bijiashan-type Pb-Zn deposits be used to represent two mineral deposit models with different characteristics in the Xicheng orefield.Abstract: It was previously considered that all of the Pb-Zn deposits in the Xicheng orefield belong to Devonian hydrothermal-sedimentary deposits or their reworked ones. Study proves that the host strata, besides the Devonian, include the Palaeoproterozoic. The super-large Changba-Lijiagou Pb-Zn deposit occurs in the Palaeoproterozoic strata. The deposits in this district are not hydrothermal-sedimentary deposits or their reworked ones, but Yanshanian-Himalayan epigenetic hydrothermal deposits. The modes of occurrence, sizes and positions of all the deposits in the Xicheng orefield are completely controlled by the choula (draw)-thrust sheet. Therefore the previous grounds for the model of the Qinling-type Pb-Zn deposits cannot hold good. The authors propose that the Changba-type and Bijiashan-type Pb-Zn deposits be used to represent two mineral deposit models with different characteristics in the Xicheng orefield.
关 键 词:mineral deposit model choula(draw)-thrust sheet Changba-type Bijiashan-type Xicheng orefield
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