Redox states and protoliths of Late Mesozoic granitoids in the eastern Jiangnan Orogen: Implications for W, Mo, Cu, Sn, and (Au) mineralization
Redox states and protoliths of Late Mesozoic granitoids in the eastern Jiangnan Orogen: Implications for W, Mo, Cu, Sn, and (Au) mineralization
复制标题
江南造山带东部晚中生代花岗岩的氧化还原态和原岩：对W、Mo、Cu、Sn、(Au)矿化的启示
DOI：
10.1016/j.oregeorev.2021.104038
复制
发表时间：
2021-02
影响因子：
3.3
通讯作者：
Deng Y.
中科院分区：
文献类型：
--
作者：
Yang Y.S.;Pan X.F.;Hou Z.Q.;Deng Y.
江南造山带东部晚中生代岩浆活动广泛发育，与钨、钼、铜、Au、锡等成矿作用密切相关。晚中生代花岗岩类在空间上（北方赣北和安徽南部）和时间上（早期：154~136 Ma，晚期：136~126 Ma）具有不同的岩石学和成矿特征。本文分析了四个晚中生代花岗岩类的锆石微量元素数据。结合已发表的江南造山带东部花岗岩类和钨锡钼铜矿床的锆石微量元素和黑云母成分数据，确定了晚中生代花岗岩类的岩浆氧化还原状态，对确定成矿能力和指导找矿具有重要意义。结果表明，安徽南部早期花岗岩已被氧化，其特征是高锆石Ce 4 +/Ce 3+（中位数= 278）、Ce/Nd（中位数= 17.1）和EuN/EuN *（中位数= 0.42）比值，高黑云母Fe 3 +/Fe 2+比值（中位数= 0.23）和XMg值（中位数= 0.48）。皖南晚阶段花岗岩相对减少，锆石Ce 4 +/Ce 3+（中位数= 49.7）、Ce/Nd（中位数= 12.7）、EuN/EuN *（中位数= 0.16）比值较低，黑云母Fe 3 +/Fe 2+比值（中位数= 0.11）和XMg值（中位数= 0.38）较低。赣北方早期花岗岩类呈某种还原氧化还原状态。它们具有相对较低的锆石Ce 4 +/Ce 3+（中值= 17.28）、Ce/Nd（中值= 4.50）和EuN/EuN *（中值= 0.17）比值，以及相对较低的黑云母Fe 3 +/Fe 2+比值（中值= 0.07，N = 160）和XMg值（中值= 0.35）。赣北方晚期花岗岩类强烈还原，锆石Ce 4 +/Ce 3+比值（中位数= 17.03）、Ce/Nd比值（中位数= 0.72）、EuN/EuN * 比值（中位数= 0.02）较低，黑云母Fe 3 +/Fe 2+比值（中位数= 0.06）和XMg值（中位数= 0.25）较低。地球化学和同位素资料表明，赣北方早期花岗岩类来源于新元古代变质沉积岩，而皖南早期花岗岩类则来源于新元古代火山-沉积岩系。江南造山带东部晚期花岗岩类形成于拉张体制下，是由各种地幔输入的深熔作用形成的。结果表明，皖南早期花岗岩类具有Cu（> 1Mt）和Mo（> 0.3Mt）成矿潜力，晚期花岗岩类与W、Cu（<1Mt）和Mo（<0.3Mt）成矿潜力有关。在江西北方，早期花岗岩类演化程度高，相对还原，更有可能形成大型-超大型W矿化，其次为Cu（<1Mt）和Mo（<0.3Mt）矿化，而类似的还原演化晚期花岗岩类则与大型至超大型锡、钨矿化密切相关，其次为铜（<1 Mt）和钼（<0.3 Mt）矿化。不同岩浆氧化还原作用
Late Mesozoic magmatism is extensively developed in the eastern Jiangnan Orogen and is closely related to W, Mo, Cu, Au, and Sn mineralization. Late Mesozoic granitoids show various petrological and mineralizing features that vary spatially (northern Jiangxi Province and southern Anhui Province) and temporally (early stage: 154 to 136 Ma, late stage: 136 to 126 Ma). In this study, we analyzed zircon trace element data from four Late Mesozoic granitoids. Together with published zircon trace element data and biotite compositions from granitoids in the eastern Jiangnan Orogen and W–Sn, Mo and Cu deposits, we use these data to determine the magmatic redox state of the Late Mesozoic granitoids, which is useful in determining mineralization competency and is instructive during exploration. The results show that early stage granitoids of southern Anhui Province are oxidized, characterized by high zircon Ce4+/Ce3+(median =278), Ce/Nd (median =17.1), and EuN/EuN* (median =0.42) ratios, and high biotite Fe3+/Fe2+ratios (median =0.23) and XMg values (median =0.48). The late stage granitoids of southern Anhui Province are relatively reduced, showing lower zircon Ce4+/Ce3+(median =49.7), Ce/Nd (median =12.7), and EuN/EuN* (median =0.16) ratios, and lower biotite Fe3+/Fe2+ratios (median =0.11) and XMg values (median =0.38). The early stage granitoids of northern Jiangxi Province show a somewhat reduced redox state. They have comparatively low zircon Ce4+/Ce3+(median =17.28), Ce/Nd (median =4.50), and EuN/EuN* (median =0.17) ratios, and comparatively low biotite Fe3+/Fe2+ratios (median =0.07, N =160) and XMg values (median =0.35). The late stage granitoids of northern Jiangxi Province are strongly reduced, characterized by low zircon Ce4+/Ce3+(median =17.03), Ce/Nd (median =0.72), and EuN/ EuN* (median =0.02) ratios, and low biotite Fe3+/Fe2+ratios (median =0.06) and XMg values (median =0.25). Geochemical and isotopic data reveal that early stage granitoids in northern Jiangxi Province were sourced from Neoproterozoic metasedimentary rocks, whereas those in southern Anhui Province originated from Neoproterozoic volcanic–sedimentary sequences. The late stage granitoids in the eastern Jiangnan Orogen formed under an extensional regime and were generated by anatexis with various mantle inputs. The results suggest that early stage granitoids of southern Anhui Province have the potential for Cu (>1 Mt) and Mo (>0.3 Mt) mineralization, whereas late stage granitoids are related to W, Cu (<1 Mt), and Mo (<0.3 Mt). In northern Jiangxi Province, the highly evolved and relatively reduced early stage granitoids have more potential to form large- to super-large-scale W mineralization, with subordinate Cu (<1 Mt) and Mo (<0.3 Mt) mineralization, whereas the similarly reduced and evolved late stage granitoids are closely associated with large- to super-large-scale Sn and W mineralization, with subordinate Cu (<1 Mt) and Mo (<0.3 Mt) mineralization. Different magmatic redox
登录
查看更多内容
影响因子：
5
作者：
Hoskin, PWO
通讯作者：
Hoskin, PWO
影响因子：
3.5
作者：
Vladimir Matjuschkin;R. Brooker;B. Tattitch;J. Blundy;C. C. Stamper-C.
通讯作者：
Vladimir Matjuschkin;R. Brooker;B. Tattitch;J. Blundy;C. C. Stamper-C.
DOI：
10.18654/1000-0569/2019.12.14
发表时间：
2019-12
期刊：
岩石学报
影响因子：
--
作者：
陈雪锋;范裕;庾江华;钱仕龙;陆中秋;杨张一;洪建民;肖鑫
通讯作者：
肖鑫
华南赣北皖南地区和赣南地区含钨花岗岩及相关矿化对比研究
DOI：
10.1007/s11430-016-9071-6
发表时间：
2017-07
期刊：
SCIENCE CHINA: Earth Sciences
影响因子：
--
作者：
苏慧敏;蒋少涌
通讯作者：
蒋少涌
影响因子：
3.9
作者：
Burnham, A. D.;Berry, A. J.;Mosselmans, J. F. W.
通讯作者：
Mosselmans, J. F. W.