Ages and genesis of W-Sn and Ta-Nb-Sn-W mineralization associated with the Limu granite complex, Guangxi, China
Ages and genesis of W-Sn and Ta-Nb-Sn-W mineralization associated with the Limu granite complex, Guangxi, China
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广西梨木花岗岩杂岩中钨锡和钽铌锡钨矿化的时代及成因
DOI：
10.1016/j.lithos.2019.105321
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发表时间：
2020
期刊：
影响因子：
3.5
通讯作者：
Chen Xilian
中科院分区：
文献类型：
--
作者：
Huang Wenting;Wu Jing;Liang Huaying;Zhang Jian;Ren Long;Chen Xilian
栗木花岗杂岩体跨越了三个花岗岩期，形成了华南印支期最大的钽铌锡钨矿田。与第二阶段花岗岩有关的石英脉型W单键Sn矿化（1型）和与第三阶段花岗岩有关的Ta Nb Sn W矿化（2型），包括石英长石脉型、伟晶岩脉型和浸染型。通过对栗木花岗岩杂岩的白云母40 Ar/39 Ar年龄、锆石LA-ICP-MS U单键Pb年龄、Lusingle键Hf、Nd同位素、微量元素和地球化学组成的研究，阐明了这些成矿类型的岩浆演化和成因。栗木花岗岩为过铝质（A/CNK > 1.1），Nd（t）值为负值（−8.5 ~ −9.7），TDM 2年龄为1780-1685 Ma，表明其主要来源于古元古代基底的部分熔融。加里东期锆石（429.4 ± 5.6Ma）的残留表明源区为加里东期花岗岩熔融。第二、第三期花岗岩的Zr/Hf（<13）和Nb/Ta（<5）比值较低，稀土元素配分模式中的四分体效应表明岩浆演化程度较高，经历了晚期流体出溶作用。Ⅰ型矿石中白云母的40 Ar/39 Ar年龄为213.7 ± 1.1Ma。含4型矿化的第三期花岗岩中的两个热液锆石和两个白云母样品获得了相似的U-Pb年龄。203 Ma和40 Ar/39 Ar年龄。208马，分别。我们认为，第一类矿化形成于约。Ta-Nb-Sn-W矿化形成于约214 Ma，为热液成因。208-203 Ma，为岩浆热液成因。来自长期岩浆房的幔源热是形成富Ta-Nb-Sn-W熔体的高温深熔作用的必要条件，印支期地壳增厚、局部拆沉、软流圈上涌和深部断裂的综合作用促进了热量的持续供应。
The Limu granite complex spans three granitic stages, forming the largest Indosinian Ta–Nb–Sn–W ore field in South China. There includes quartz-vein Wsingle bondSn (type-1) mineralization associated with second-stage granite, as well as Ta–Nb–Sn–W mineralization associated with third-stage granite including quartz–feldspar-vein (type-2), pegmatite dike (type-3), and disseminated (type-4) mineralization. To elucidate the magmatic evolution and genesis of these types of mineralization, we obtained muscovite40Ar/39Ar ages, zircon LA–ICP–MS Usingle bondPb ages, and Lusingle bondHf and Nd isotopic, trace-element, and geochemical compositions of the Limu granite complex. The Limu granites are peraluminous (A/CNK > 1.1) with negative ɛNd(t) values (−8.5 to −9.7) and TDM2ages of 1780–1685 Ma, suggesting that they were derived mainly from partial melting of Paleoproterozoic basement. Remnants of Caledonian zircons (429.4 ± 5.6 Ma) indicate Caledonian granite melting in the source. Low Zr/Hf (<13) and Nb/Ta (<5) ratios and the tetrad effect in rare-earth-element patterns of the second- and third-stage granites indicate that the magmas were highly evolved and underwent late-stage exsolution of fluids. Muscovite from type-1 ore yielded an40Ar/39Ar age of 213.7 ± 1.1 Ma. Two hydrothermal zircons and two muscovite samples from third-stage granite containing type-4 mineralization yielded similar Usingle bondPb ages of ca. 203 Ma and40Ar/39Ar ages of ca. 208 Ma, respectively. We conclude that type-1 mineralization was formed at ca. 214 Ma and was hydrothermal in origin, whereas Ta–Nb–Sn–W mineralization was formed at ca. 208–203 Ma and was of magmatic-hydrothermal origin. Mantle-derived heat from a long-lived magma chamber was essential for the high-temperature anatexis that formed Ta–Nb–Sn–W-rich melts, with the combined effects of crustal thickening during the Indosinian Orogeny, local delamination, asthenospheric upwelling, and deep faulting facilitating the continuous supply of heat.
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影响因子：
5
作者：
Hoskin, PWO
通讯作者：
Hoskin, PWO
华南地块牛塘街地区矽卡岩W矿化年龄及花岗岩组合
影响因子：
3.3
作者：
Chen Xilian;Liang Huaying;Richards Jeremy P.;Huang Wenting;Zhang Jian;Wu Jing;Sotiriou Paul
通讯作者：
Sotiriou Paul
DOI：
--
发表时间：
2002
期刊：
--
影响因子：
--
作者：
W. Gang
通讯作者：
W. Gang
影响因子：
6.1
作者：
Yuejun Wang;W. Fan;Guowei Zhang;Yanhua Zhang
通讯作者：
Yuejun Wang;W. Fan;Guowei Zhang;Yanhua Zhang
影响因子：
1.8
作者：
L. Nardi;M. Formoso;K. Jarvis;L. Oliveira;A. C. B. Neto;E. Fontana
通讯作者：
L. Nardi;M. Formoso;K. Jarvis;L. Oliveira;A. C. B. Neto;E. Fontana