北秦岭二郎坪杂岩变沉积岩碎屑锆石年代学及其构造地质意义.pdf

1000-0569 /2016 /032 (05)-1452-66 Acta Petrologica Sinica 岩石学报 北秦岭二郎坪杂岩变沉积岩碎屑锆石年代学及其 * 构造地质意义 ＊＊ 杨敏 刘良 王亚伟 廖小莹 康磊 盖永升 YANG Min ，LIU Liang ＊＊ ，WANG YaWei ，LIAO XiaoYing ，KANG Lei and GAI YongSheng 大陆 ， ， 710069 动力学国家重点实验室 西北大学地质学系 西安 State Key Laboratory of Continental Dynamics ，Department of Geology ，Northwest University ，Xi ’an 710069 ，China 2015-01-29 收稿，2016-01-10 改回. Yang M ，Liu L ，Wang YW ，Liao XY ，Kang L and Gai YS. 2016. Geochronology of detrital zircons from metaclastic of Erlangping complex in the North Qinling belt and its tectonic implication. Acta Petrologica Sinica ，32 (5):1452 － 1466 Abstract Detrital zircon is the most stable minerals in the sedimentary rocks. The detrital zircon age spectra are widely used to determine the maximum age of deposition ，to identify the provenance in sedimentary rocks and to study the evolution history on their source region. Erlangping complex ，one of the main tectono-stratigraphic units of the North Qinling belt ，consists of three tectonic slices :the northern clastic slice ，the middle ophiolite slice and the southern metaclastic slice. This paper carried out the detrital zircons from the southern metaclastic slice by LA-ICP-MS U-Pb dating. The concordant zircon ages from the metaclastic sample range from 500 ± 7Ma to 3894 ± 5Ma. The age spectrum displays one dominant peak at 0. 9 ～ 1. 0Ga and six sub-dominant peaks at 500 ～ 600Ma ，750 ～ 850Ma ，ca. 1. 35 ～ 1. 48Ga ，ca. 1. 6 ～ 1. 75Ga ，ca. 2. 6 ～ 2. 7Ga and ca. 3. 0 ～ 3. 4Ga ，which indicate :1)the youngest detrital zircon age of 500Ma from Erlangping complex demonstrated the maximum depositional age. Xizhuanghe granodiorite intruded into the southern metaclastic slice ，which gave