Evidence for metasomatic mantle carbonatitic magma extrusion in Mesoproterozoic ore-hosting dolomite rocks in the middle Kunyang rift, central Yunnan, China

doi:10.1016/j.pnsc.2008.01.027

	Evidence for metasomatic mantle carbonatitic magma extrusion in Mesoproterozoic ore-hosting dolomite rocks in the middle Kunyang rift, central Yunnan, China
	Zhang, Yongbei 1,2,3; Bi, Hua 1; Yu, Longshi 1; Sun, Shihua 3; Qiu, Jiaxiang 2; Xu, Chengyan 2; Wang, Hao 2; Wang, Renjing 2
刊名	PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
	2008-08-10
卷号	18 期号:8 页码:965-974
关键词	central Yunnan Kunyang rift Precambrian mineralization carbonatitite volcanic rocks petrogenesis iron and copper ore deposit
ISSN号	1002-0071
DOI	10.1016/j.pnsc.2008.01.027
文献子类	Article
英文摘要	The Kunyang rift lying on the western margin of the Yangtze platform is a rare Precambrian Fe-Cu mineralization zone. Wuding-Lufeng basin that is an important part of the zone is located on the west edge in the middle of the rift. The most important ore-hosting rocks are Mesoproterozoic dolomite rocks in the basin controlled by a ring fracture system, which is a fundamental structure of the basin. Plenty of silicate minerals and acicular apatite, feldspar phenocrysts and small vesicular, flown line and flown plane structures, melt inclusion and high temperature fluid inclusion found in most ore-hosting dolomites suggest that this kind of rocks could not be sedimentary dolomite, marble or hydrothermal carbonate rocks. The Zr/Hf and Nb/Ta values of the rocks are identical with those of associated mantle-derived rocks, and vary widely. For the monomineral dolomite, delta(18)O(SMOW)parts per thousand = +5.99 to +18.4 and delta(13)C(PDB)parts per thousand = -3.01 to +0.94, which fall within the range for all carbonatitic volcanic rocks of the world. As for the accessory minerals, the values of delta(18)O(SMOW)parts per thousand of magnetite (=+3.47 to +5.99 parts per thousand) are close to that of the mantle (<5.7%), and the delta(34)S parts per thousand values of sulfides (-5.09 to +5.78, averaging +1.50) are close to that of meteorite. For all the ore-bearing dolomite rocks, epsilon(Nd) = +0.19 to +2.27, and the calculated I(Sr) = 0.699143, while for the associated mantle-derived rocks, epsilon(Nd) = +3.18 to +3.72. All the data suggest that the mineral assemblage is not only igneous but also of metasomatic mantle origin. And the presence of acicular apatite indicates that the rocks were formed by magma rapidly cooling. And the phenocryst texture and vesicular, flown and ropy and pyroclastic structures suggest that the igneous rocks were extrusive. Therefore, the ore-bearing dolomite rocks are carbonatitic volcanic rocks. This conclusion implies that most iron and copper ore deposits hosted in the dolomite rocks should be of the carbonatite type. (C) 2008 National Natural Science Foundation of China and Chinese Academy of Sciences. Published by Elsevier Limited and Science in China Press. All rights reserved.
WOS关键词	ISOTOPE
WOS研究方向	Materials Science ; Science & Technology - Other Topics
语种	英语
出版者	ELSEVIER SCIENCE INC
WOS记录号	WOS:000259543300008
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/68862]
专题	中国科学院地质与地球物理研究所
通讯作者	Bi, Hua
作者单位	1.Hainan Normal Univ, Dept Resources Environm & Tourism, Longshepo 57000, Haikou, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 3.China Univ Geosci, Fac Earth Sci, Wuhan 470074, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yongbei,Bi, Hua,Yu, Longshi,et al. Evidence for metasomatic mantle carbonatitic magma extrusion in Mesoproterozoic ore-hosting dolomite rocks in the middle Kunyang rift, central Yunnan, China[J]. PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL,2008,18(8):965-974.
APA	Zhang, Yongbei.,Bi, Hua.,Yu, Longshi.,Sun, Shihua.,Qiu, Jiaxiang.,...&Wang, Renjing.(2008).Evidence for metasomatic mantle carbonatitic magma extrusion in Mesoproterozoic ore-hosting dolomite rocks in the middle Kunyang rift, central Yunnan, China.PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL,18(8),965-974.
MLA	Zhang, Yongbei,et al."Evidence for metasomatic mantle carbonatitic magma extrusion in Mesoproterozoic ore-hosting dolomite rocks in the middle Kunyang rift, central Yunnan, China".PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL 18.8(2008):965-974.