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引用本文:陈世忠 黄正清 朱筱婷 陈 刚 马 明. 武夷山成矿带桃溪环形构造区典型矿床成矿背景[J]. 中国地质, 2013, 40(5): 1569-1582.
CHEN Shi-zhong, HUANG Zheng-qing, ZHU Xiao-ting, CHEN Gang, MA Min. Magmatism and ore-forming background of the main deposits in Taoxi circular structure along the Wuyishan ore belt[J]. Geology in China, 2013, 40(5): 1569-1582(in Chinese with English abstract).
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武夷山成矿带桃溪环形构造区典型矿床成矿背景
陈世忠 黄正清 朱筱婷 陈 刚 马 明
中国地质调查局南京地质调查中心,江苏 南京 210016
摘要:
提要:武夷山成矿带发育大量的环形构造,桃溪环形构造位于成矿带南部。沿环形构造周边分布大量的大中型铜多金属矿,紫金山铜金矿、岩背锡矿和红山铜矿是其代表。这些矿床成矿年龄集中于125~90 Ma,与桃溪环形带上大多数矿床一样表现为斑岩型-岩浆热液型铜多金属矿成矿特征。紫金山、岩背和红山矿床的成矿斑岩体成岩年龄94~133 Ma,多为燕山期复式杂岩体中晚期,是中生代晚期壳幔作用的产物。桃溪环形构造是构造作用和岩浆作用的结果,并导致了与构造和岩浆相关的成矿作用。
关键词:  桃溪环形构造  武夷山成矿带  紫金山铜金矿  成矿斑岩
DOI:
分类号:
基金项目:中国地质调查局“武夷山矿带铜多金属矿勘查选区评价项目”(1212010813065)资助。
Magmatism and ore-forming background of the main deposits in Taoxi circular structure along the Wuyishan ore belt
CHEN Shi-zhong, HUANG Zheng-qing, ZHU Xiao-ting, CHEN Gang, MA Min
Nanjing Institute of Geology and Mineral Resources, China Geological Survey, Nanjing 210016, Jiangsu, China
Abstract:
Abstract:Taoxi circular structure is one of the circular structures and also a part of Wuyishan uplift and appears as metamorphic core complexes. There are abundant medium-large sized copper and polymetallic ore deposits distributed within the circular structure, such as Zijinshan Cu-Au deposit, Yanbei Sn deposit and Hongshan Cu deposit. The Zijinshan Cu-Au deposit has the biggest gold ore reserves in China and the Yanbei deposit is a superlarge deposit with more than 300,000 t Sn. The area represents a rich segment of the Wuyi metallogenic belt. The main geochronologic dating of mineralization yielded ages in the range of 130-90Ma, suggesting the Late Yanshanian period. The ore deposits as well as most copper-gold ore deposits located in Taoxi circular structure are of porphyry-magmatic hydrothermal type. The Zijinshan Cu-Au deposit, the Yanbei Sn deposit and the Hongshan Cu deposit all how that the ore-forming porphyries are I-type granites and their ages are from 94 to 133Ma, close to the age of mineralization (125-90Ma). Both magmatism and mineralization occurred in the circular structure, which are called “Mesozoic magmatic and metallogenic explosion”. Geochronologic dating of ore-bearing porphyry stocks yielded ages of 90-133Ma, implying the middle to late period derivatives of Yanshanian magmatic complex that resulted from the interaction of the crust with the mantle and the lithosphere delamination in the Late Mesozoic period. The swelling of Taoxi circular structure and the development of the rift together with the intrusion and eruption of the magma accelerated metallogenic process in the study area. Taoxi circular structure is characterized by lithosphere thickening and delamination, intrusion of the asthenosphere-derived mafic rocks, and accompanied mineralization.
Key words:  Taoxi circular structure  Wuyishan ore belt  Zijinshan Cu-Au deposit  ore-forming porphyry