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

Volume 39 Issue 6

Jun. 2014

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Article Navigation > Earth Science > 2014 > 39(6): 687-695

Wan Duo, Li Jianfeng, Wang Yicun, Wang Keyong, Wang Zhigao, Wei Liangmin, 2014. Re-Os Radiometric Dating of Molybdenite in Hongling Lead-Zinc Polymetallic Deposit, Inner Mongolia, and Its Significance. Earth Science, 39(6): 687-695. doi: 10.3799/dqkx.2014.064

Citation:

Wan Duo, Li Jianfeng, Wang Yicun, Wang Keyong, Wang Zhigao, Wei Liangmin, 2014. Re-Os Radiometric Dating of Molybdenite in Hongling Lead-Zinc Polymetallic Deposit, Inner Mongolia, and Its Significance. Earth Science, 39(6): 687-695. doi: 10.3799/dqkx.2014.064

Citation:

Wan Duo, Li Jianfeng, Wang Yicun, Wang Keyong, Wang Zhigao, Wei Liangmin, 2014. Re-Os Radiometric Dating of Molybdenite in Hongling Lead-Zinc Polymetallic Deposit, Inner Mongolia, and Its Significance. Earth Science, 39(6): 687-695. doi: 10.3799/dqkx.2014.064

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

doi: 10.3799/dqkx.2014.064

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

Received Date: 2013-12-09
Publish Date: 2014-06-15

Abstract

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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References(52)

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

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