Sulfur and Lead Isotopic Compositions of Habilig Uranium Deposit in Northern Margin of North China Block: Implication for Uranium Mineralization

doi:10.19657/j.geoscience.1000-8527.2020.03.15

Abstract

Abstract:

Habilig uranium deposit is located in the middle part of northern margin of North China Block, which is mainly controlled by the Ulanhada-Houershan anticline and regional faults. Uranium mineralization occurs mainly in quartzite of the second member of the Wulashan Group in the Neoarchaean, and has long been consi-dered to be a metamorphic uranium deposit. Based on the study of the geological setting and mineralization cha-racteristics of the deposit, the sulfur and lead isotope compositions of pyrite in ores and surrounding rocks are systematically analyzed. The analysis results show that the sulfur isotope value varies from -4.7‰ to 12.9‰, suggesting that source of ore-forming fluids are mainly from magmatic hydrothermal fluids and are contaminated by stratigraphic materials as well. Lead isotope composition (²⁰⁸Pb/²⁰⁴Pb=36.147-42.968, ²⁰⁷Pb/²⁰⁴Pb=15.919- 34.268, ²⁰⁶Pb/²⁰⁴Pb=19.488-168.032) is much higher than that of single-stage evolution model. ²⁰⁷Pb/²⁰⁴Pb-²⁰⁶Pb/²⁰⁴Pb in different samples have a good linear relationship and represent a typical two-stage lead isotope evolution system, indicating that metamorphic strata provide uranium source for ore-forming fluid. Based on ²⁰⁷Pb/²⁰⁶Pb equation and history of regional magmatic evolution, it is considered that uranium was preliminarily enriched in the Wulashan Group because of the regional metamorphism in Paleoproterozoic (~1 805 Ma). In Late Paleozoic (374 Ma), a large amount of magmatic fluids generated from granodiorite magma, which have activated and extracted uranium from metamorphic strata and contributed to mineralization in favorable structure.

Key words: sulfur isotope, lead isotope, uranium mineralization, Habilig uranium deposit, northern margin of North China Block

CLC Number:

HUANG Zhixin, LI Ziying, CAI Yuqi, ZHU Bin, REN Quan. Sulfur and Lead Isotopic Compositions of Habilig Uranium Deposit in Northern Margin of North China Block: Implication for Uranium Mineralization[J]. Geoscience, 2020, 34(03): 588-597.

Figures/Tables 8

References 43

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样号	岩性	矿物	δ³⁴S_V-CDT/ ‰	w(U)/ 10^-6	w(Th)/ 10^-6
HB13-50	石英岩	黄铁矿	6.6	9.5	2.29
HB13-55	石英岩	黄铁矿	9.0	1 456.0	5.46
HB13-58	变粒岩	黄铁矿	-4.7	437.0	426.00
HB13-65	角闪二云片岩	黄铁矿	12.9	8.8	10.70
HB13-71	石英岩	黄铁矿	3.4	159.0	4.18

样号	岩性	矿物	δ³⁴S_V-CDT/ ‰	w(U)/ 10^-6	w(Th)/ 10^-6
HB13-50	石英岩	黄铁矿	6.6	9.5	2.29
HB13-55	石英岩	黄铁矿	9.0	1 456.0	5.46
HB13-58	变粒岩	黄铁矿	-4.7	437.0	426.00
HB13-65	角闪二云片岩	黄铁矿	12.9	8.8	10.70
HB13-71	石英岩	黄铁矿	3.4	159.0	4.18

样号	岩性	矿物	²⁰⁸Pb/²⁰⁴Pb	标准误差	²⁰⁷Pb/²⁰⁴Pb	标准误差	²⁰⁶Pb/²⁰⁴Pb	标准误差
HB13-50	石英岩	黄铁矿	37.975	0.006	34.268	0.005	168.032	0.023
HB13-55	石英岩	黄铁矿	36.402	0.005	15.982	0.002	19.488	0.002
HB13-58	变粒岩	黄铁矿	42.968	0.005	15.919	0.002	20.946	0.002
HB13-65	角闪二云片岩	黄铁矿	41.312	0.006	16.330	0.002	22.230	0.003
HB13-71	石英岩	黄铁矿	36.147	0.007	18.453	0.003	35.922	0.006

样号	岩性	矿物	²⁰⁸Pb/²⁰⁴Pb	标准误差	²⁰⁷Pb/²⁰⁴Pb	标准误差	²⁰⁶Pb/²⁰⁴Pb	标准误差
HB13-50	石英岩	黄铁矿	37.975	0.006	34.268	0.005	168.032	0.023
HB13-55	石英岩	黄铁矿	36.402	0.005	15.982	0.002	19.488	0.002
HB13-58	变粒岩	黄铁矿	42.968	0.005	15.919	0.002	20.946	0.002
HB13-65	角闪二云片岩	黄铁矿	41.312	0.006	16.330	0.002	22.230	0.003
HB13-71	石英岩	黄铁矿	36.147	0.007	18.453	0.003	35.922	0.006