Fluid inclusions and oxygen isotope study of the Sijiaying BIF in the eastern Hebei Province

CORC > 中国地质调查局 > 中国地质调查局 > 中国地质科学院矿产资源研究所

	Fluid inclusions and oxygen isotope study of the Sijiaying BIF in the eastern Hebei Province
	Chen Jing 5; Li HouMin ; Li LiXing ; Yang XiuQing 1; Liu MingJun 2; Yao Tong 1; Hu Bin ; Zhang JinYou 3
刊名	ACTA PETROLOGICA SINICA
	2014
卷号	30 期号:5 页码:1253-1268
关键词	Sijiaying BIF Fluid inclusions High-grade iron ore Eastern Hebei Province
ISSN号	1000-0569
英文摘要	The Sijiaying BIF, the largest iron deposit in the eastern Hebei Province, located in the center part of Eastern Block, North China Craton, is hosted in epidote-amphibolite facies Neoarchean metamorphic rocks. The evolutionary process can be divided into depositional stage, epidote-amphibolite facies metamorphic stage, folding and deformation stage, shearing and hydrothermal alteration stage, uplifting and oxidizing stage. Both striped actinolite-magnetite-quartzite occured in epidote-amphibolite facies metamorphic stage and banded actinolite-magnetite-quartzite, massive magnetite-quartzite, pyrite-quartz veins formed in shearing and hydrothermal alteration stage contain a variety of fluid inclusions. Five types of inclusions are distinguished including primary (I-type) inclusions, pseudosecondary (II-type) inclusions, secondary (III-type) inclusions, daughter mineral-bearing (IV-type) inclusions, CO2-bearing three-phase (V-type) inclusions. The homogenization temperatures of the II-type and III-type fluid inclusions in quartz-1 in striped actinolite-magnetite-quartzite as well as V-type inclusions in quartz-1 in banded actinolite-magnetite-quartzite range from 352 similar to 560 degrees C, with trapping pressure between 0.11GPa and 0.20GPa and salinities rang from 0.4%similar to 3.3% NaCleqv. They reflect the temperature and pressure of epidote-amphibolite facies metamorphism. The homogenization temperatures of the II-type and III-type fluid inclusions in quartz-2 in banded actinolite-magnetite-quartzite, massive magnetite-quartzite and pyrite-quartz veins concentrate in 153 similar to 212 degrees C, with salinities between 0.5% NaCleqv and 22.6% NaCleqv. The delta O-18 values of magnetite-1 from striped actinolite-magnetite-quartzite range from 1.4 parts per thousand to 2.8 parts per thousand; While the delta O-18 values of magnetite-2 from banded magnetite-quartzite and massive magnetite-quartzite range from 1.7 parts per thousand to 6.2 parts per thousand, these data indicating fluids of shearing and hydrothermal alteration stage may account for leaching Si and concentrating Fe in Sijiaying BIF, hypogene (hypergene) fluids circulated through shear zones and resulted in forming banded actinolite-magnetite-quartzite, massive magnetite-quartzite and pyrite-quartz veins. Moreover, multi-stage fold and deformation activities may also played an important role in forming banded actinolite-magnetite-quartzite. The homogenization temperatures of I-type inclusions in quartzs in all types of ores range from 117 similar to 223 degrees C, with salinities mainly between 0.4% NaCleqv and 5.0% NaCleqv, which reflects the characteristics of fluids in the uplifting and oxidizing stage. Relatively low oxidation may be the main reason for which Sijiaying BIF unable formed a large scale of high-grade martite-microplaty ore.
学科主题	矿床地质
WOS关键词	NORTH CHINA ; WESTERN-AUSTRALIA ; IRON DEPOSITS ; HYDROTHERMAL ORIGIN ; HAMERSLEY PROVINCE ; QINLING OROGEN ; ORE-DEPOSIT ; EVOLUTION ; BEARING ; CRATON
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000337205700005
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40415]
专题	中国地质科学院矿产资源研究所
作者单位	1.Chinese Acad Geol Sci, Inst Mineral Resources, MLR Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China 2.China Univ Geosci, Fac Earth Sci & Resource, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China 3.Liaoning Bur Met Geol Explorat, Inst Geol Explorat, Anshan 114038, Peoples R China 4.Hebei Geol & Min Bur, Geol Team 5, Tangshan 063004, Peoples R China 5.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Chen Jing,Li HouMin,Li LiXing,et al. Fluid inclusions and oxygen isotope study of the Sijiaying BIF in the eastern Hebei Province[J]. ACTA PETROLOGICA SINICA,2014,30(5):1253-1268.
APA	Chen Jing.,Li HouMin.,Li LiXing.,Yang XiuQing.,Liu MingJun.,...&Zhang JinYou.(2014).Fluid inclusions and oxygen isotope study of the Sijiaying BIF in the eastern Hebei Province.ACTA PETROLOGICA SINICA,30(5),1253-1268.
MLA	Chen Jing,et al."Fluid inclusions and oxygen isotope study of the Sijiaying BIF in the eastern Hebei Province".ACTA PETROLOGICA SINICA 30.5(2014):1253-1268.