Geology, C–H–O–S–Pb isotope systematics and geochronology of the Yindongpo gold deposit, Tongbai Mountains, central China: Implication for ore genesis
Geology, C–H–O–S–Pb isotope systematics and geochronology of the Yindongpo gold deposit, Tongbai Mountains, central China: Implication for ore genesis
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中国中部桐柏山银洞坡金矿地质、C-H-O-S-Pb同位素系统学和年代学：对成矿的启示
DOI：
10.1016/j.oregeorev.2013.01.017
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发表时间：
2013-09
影响因子：
3.3
通讯作者：
Wang C
中科院分区：
文献类型：
--
作者：
Zhang J;Chen Y J;Pirajno F;Deng J;Chen H Y;Wang C
银洞坡金存款矿床位于桐柏山围山城金银多金属成矿带内。矿体层控于新元古代歪头山群碳质石英绢云母片岩中。成矿作用可分为早期石英脉、中期多金属硫化物细脉和晚期石英-碳酸盐网脉3个阶段，黄铁矿、方铅矿、自然金、银金矿等主要矿石矿物形成于中期。δ 18 O水平均值由早期的9.7‰、中期的4.9‰、晚期的−5.9‰变化，δD值变化在−65‰ ~ −84‰之间。成矿流体的δ 13 CCO 2值在-3.7 ‰ ~+6.7‰之间，平均为1.1‰。H-O-C同位素体系表明，银洞坡金存款成矿流体可能最初来源于变质脱挥作用，随时间推移逐渐与大气降水混合。δ 34 S值在-0.3 ‰至+5.2‰之间，峰值在+1‰至+4‰之间。14个硫化物样品的206 Pb/204 Pb值为16.990- 17.216，207 Pb/204 Pb值为15.419-15.612，208 Pb/204 Pb值为38.251-38.861。S、Pb同位素比值与歪头山群主要岩性相似，但与桐柏地区其他岩性单元和花岗岩基不同，表明成矿金属和成矿流体均来自歪头山群。有效K-Ar和40 Ar/39 Ar年龄表明，成矿作用主要发生在176- 140 Ma，即秦岭造山带由碰撞挤压向伸展过渡和大洋通道闭合后。银洞坡金存款是在碰撞挤压向伸展过渡阶段形成的层控造山型金系统。歪头山群中的矿石金属在碳质绢云母片岩层中被提取、搬运、富集。碳质绢云母片岩层，特别是在塌陷背斜轴部与断裂构造的交接处，是矿体最有利的赋存部位。
The Yindongpo gold deposit is located in the Weishancheng Au–Ag-dominated polymetallic ore belt in Tongbai Mountains, central China. The ore bodies are stratabound within carbonaceous quartz–sericite schists of the Neoproterozoic Waitoushan Group. The ore-forming process can be divided into three stages, represented by early barren quartz veins, middle polymetallic sulfide veinlets and late quartz–carbonate stockworks, with most ore minerals, such as pyrite, galena, native gold and electrum being formed in the middle stage. The average δ18Owatervalues changed from 9.7‰ in the early stage, through 4.9‰ in the middle stage, to −5.9‰ in the late stage, with the δD values ranging between −65‰ and −84‰. The δ13CCO2values of ore fluids are between −3.7‰ and +6.7‰, with an average of 1.1‰. The H–O–C isotope systematics indicate that the ore fluids forming the Yindongpo gold deposit were probably initially sourced from a process of metamorphic devolatilization, and with time gradually mixed with meteoric water. The δ34S values range from −0.3‰ to +5.2‰, with peaks ranging from +1‰ to +4‰. Fourteen sulfide samples yield206Pb/204Pb values of 16.990–17.216,207Pb/204Pb of 15.419–15.612 and208Pb/204Pb of 38.251–38.861. Both S and Pb isotope ratios are similar to those of the main lithologies of the Waitoushan Group, but differ from other lithologic units and granitic batholiths in the Tongbai area, which suggest that the ore metals and fluids originated from the Waitoushan Group. The available K–Ar and40Ar/39Ar ages indicate that the ore-forming process mainly took place in the period of 176–140Ma, during the transition from collisional compression to extension and after the closure of the oceanic seaway in the Qinling Orogen. The Yindongpo gold deposit is interpreted as a stratabound orogenic-style gold system formed during the transition phase from collisional compression to extension. The ore metals in the Waitoushan Group were extracted, transported and then accumulated in the carbonaceous sericite schist layer. The carbonaceous sericite schist layer, especially at the junction of collapsed anticline axis and fault structures, became the most favorable locus for the ore bodies.
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DOI：
10.1007/bf02882259
发表时间：
2001-03
期刊：
Science in China Series D: Earth Sciences
影响因子：
--
作者：
Huayong Chen;Yan‐jing Chen;Yulin Liu
通讯作者：
Huayong Chen;Yan‐jing Chen;Yulin Liu
影响因子：
5.8
作者：
G. Collins
通讯作者：
G. Collins
红龙铺钼矿田含矿碳酸岩地球化学特征及构造背景
影响因子：
1.8
作者：
Xu Cheng;Wang LinJun;Song WenLei;Qi Liang
通讯作者：
Qi Liang
影响因子：
3.9
作者：
Huayong Chen;Yan‐jing Chen;M. Baker
通讯作者：
Huayong Chen;Yan‐jing Chen;M. Baker
影响因子：
6.1
作者：
Guochun Zhao;Yanhong He;M. Sun
通讯作者：
Guochun Zhao;Yanhong He;M. Sun