内蒙古红岭铅锌多金属矿床辉钼矿Re-Os同位素年龄及其意义

万多; 李剑锋; 王一存; 王可勇; 王志高; 魏良民

doi:10.3799/dqkx.2014.064

内蒙古红岭铅锌多金属矿床辉钼矿Re-Os同位素年龄及其意义

doi: 10.3799/dqkx.2014.064

1.
吉林大学地球科学学院，吉林长春 130061
2.
内蒙古赤峰红岭有色矿业有限责任公司，内蒙古赤峰 025420

基金项目:

中国地质调查局项目 1212011120156

详细信息

作者简介:
万多(1984-)，男，博士研究生，主要从事矿产勘查方面的研究工作.E-mail: wanduo_vip@163.com

通讯作者:
王可勇，E-mail: wangky@jlu.edu.cn

中图分类号: P736.4
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出版历程
- 收稿日期: 2013-12-09
- 刊出日期: 2014-06-15

Re-Os Radiometric Dating of Molybdenite in Hongling Lead-Zinc Polymetallic Deposit, Inner Mongolia, and Its Significance

1.
College of Earth Sciences, Jilin University, Changchun 130061, China
2.
Chifeng Hongling Nonferrous Metal Mining Co., Ltd., Chifeng 025420, China

摘要

摘要: 红岭铅锌多金属矿床为大兴安岭南段多金属成矿带的代表性矿床之一.区内发育斑岩型和矽卡岩型2种钼矿化，前者为产于花岗斑岩内呈斑点-浸染状产出的辉钼矿，后者为薄膜状辉钼矿.为确定红岭铅锌多金属矿床的成矿时代，对矿区2种类型的钼矿化进行系统研究和成矿年代测定.5件斑点状辉钼矿样品Re-Os模式年龄介于139.9±2.3 Ma~141.5±3.2 Ma之间，Re-Os等时线年龄为140.3±3.4 Ma(MSWD =0.082)，模式年龄加权平均值为140.10±1.80 Ma，两者在同一误差范围完全一致，代表了该红岭矿区斑岩型钼矿化时代为晚侏罗世.1件薄膜状辉钼矿样品模式年龄为143.7±3.6 Ma，应为铅锌矿化阶段的成矿年代上限；其Re、¹⁸⁷Os含量较其他样品高出1个数量级，揭示着2种类型钼矿化具有不同的成因，证实区内存在2期钼成矿作用.6件辉钼矿样品的Re含量特征指示其成矿物质的浅源性，应以壳源为主；极低的Re含量可能与其母岩和共生矿物组合有关.结合前人的研究成果，得出红岭铅锌多金属矿床的成岩、成矿物质均来源于增生地壳，成矿动力学背景为蒙古-鄂霍茨克造山带碰撞造山后陆壳伸展环境的认识.
- 同位素 /
- 成矿年代 /
- 辉钼矿 /
- 红岭铅锌多金属矿床
Abstract: Hongling lead-zinc polymetallic deposit share many similarities with others from the southern Daxinganling polymetallic metallogenic belt. There are two types of molybdenum mineralization in the mining area, including porphyry and skarn. The former, displaying spot-disseminated feature, occurs in granite porphyry, whereas the latter, displaying film like feature, occurs in quartz. The metallogenic age of Hongling deposit can be constrained from Re-Os isotopic dating of the two kinds of molybdenite. Five samples of spot-disseminated molybdenite yield model ages varying from 139.9±2.3 Ma to 141.5±3.2 Ma, with an isochron age of 140.3±3.4 Ma (MSWD=0.082), and a weighted average of 140.10±1.80 Ma. The isochron age and weighted average model age are consistent with one another, implying that molybdenum mineralization in Hongling deposit occurred in Late Jurassic. A film-like molybdenite sample yielded a model age of 143.7±3.6 Ma, representing the initial stage of lead-zinc mineralization. The Re-¹⁸⁷Os contents of the film-like molybdenite are higher than that of spot-disseminated molybdeniteby one order of magnitude, which hints that they have different origins and there are two phases of molybdenum mineralization. The characteristics of Re content of the 6 molybdenite samples suggest that the ore-forming elements had a shallow source, and was mainly derived from the crust. The extremely low content of Re might be du to the low Re content within its parent magma as well as its paragenetic mineral assemblage. Combined with the results of previous study, it is concluded that (a) both rock- and ore-forming materials of Hongling deposit came from hyperplasia crust; and (b) the deposit formed in a dynamical environment of continental crust extension post Mongolia-Okhotsk collisional orogeny.
- isotopes /
- metallogenic chronology /
- molybdenite /
- Hongling lead-zinc polymetallic deposit

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图 1 红岭铅锌多金属矿区地质简图及ZK-3钻孔剖面地质图

1.第四系；2.满克头鄂博组；3.大石寨组砂岩、粉砂岩、板岩等；4.大石寨组大理岩；5.大石寨组安山岩；6.断层；7.中细粒花岗岩；8.肉红色花岗斑岩；9.中粗粒花岗岩；10.花岗斑岩脉；11.闪长玢岩脉；12.蚀变带；13.铅锌矿体；14.矽卡岩；15.钼矿体；16.地名；17.见钼矿化钻孔位置；18.钻孔；19.勘探线

Fig. 1. Geological sketch map of Hongling lead-zinc polymetallic deposit and Drilling section geological map

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图 2 红岭矿区钼矿化及其显微图片

a.斑点状辉钼矿；b.斑状花岗岩；c.自形结构的辉钼矿集合体；d.薄膜状辉钼矿

Fig. 2. Microphotograph showing intergrowth of molybdenite Mineralization, bulk of lead-zinc ore from Hongling

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图 3 红岭矿区辉钼矿Re-Os等时线年龄(a)和加权平均年龄图(b)

Fig. 3. Re-Os weighed average model ages (a) and isochron age (b) of molybdenite from the Hongling lead-zinc polymetallic deposit

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表 1 红岭矿区辉钼矿Re、Os含量及Re-Os模式年龄

Table 1. Re and Os contents and Re-Os model ages of molybdenite within Hongling molybdenum-tungsten deposit

样号	样重(g)	Re(10^-9)	Os普(10^-9)	¹⁸⁷Re(10^-9)	¹⁸⁷Os(10^-9)	模式年龄(Ma)
HLZ-1	0.0579 1	224.32±0.68	0.012 5±0.000 8	140.99±0.43	0.329 2±0.002 6	140.0±1.8
HLZ-2	0.0541 2	241.77±0.73	0.013 4±0.000 8	151.96±0.46	0.354 8±0.002 8	140.0±1.8
HLZ-3	0.0722 2	94.98±0.33	0.003 5±0.001 9	59.68±0.21	0.139 2±0.001 7	139.9±1.8
HLZ-4	0.0511 2	235.56±0.70	0.002 2±0.000 4	148.06±0.44	0.349 4±0.007 0	141.5±3.2
HLZ-5	0.0566 9	121.12±0.39	0.004 5±0.002 4	76.07±0.24	0.177 4±0.002 2	139.9±2.3
HLX-1	0.0509 2	4 722.89±15.87	0.103 4±0.000 7	2 968.43±9.97	7.113 5±0.031 8	143.7±3.6

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