Garnierite mineralization from a serpentinite-derived lateritic regolith, Sulawesi Island, Indonesia: Mineralogy, geochemistry and link to hydrologic flow regime
Fu, Wei1,2; Zhang, Yinmeng1; Pang, Chongjin1; Zeng, Xiangwei1; Huang, Xiaorong1; Yang, Mengli1; Shao, Ya1; Lin, Henry2,3,4
2018-05-01
发表期刊JOURNAL OF GEOCHEMICAL EXPLORATION
卷号188期号:2018页码:240-256
文章类型Article
摘要Garnierite represents a significant nickel ore in many lateritic Ni deposits worldwide. To gain a better understanding of its nature and origin, a well-developed garnierite-hosting transect from the Kolonodale area of East Sulawesi, Indonesia, has been investigated using field geology, mineralogy and geochemical data. Garnierite occurs mainly in veins in the lower saprolite of a serpentinite-derived regolith. Mineralogically, it can be determined as an intimate mixture of Ni-rich serpentine-like (lizardite-Nepouite) and talc-like (kerolite-pimelite) phases. Results of EMP analyses indicate that Ni is preferentially enriched in the talc-like phases rather than the serpentine-like phases. A sequential precipitation of mineral phases progressively enriched in Ni and Si to form garnierite during weathering is suggested. The Ni-lizardite (2.63-8.49 wt% Ni) with elevated Fe (4.02-6.44 wt %) may have been inherited from saprolite in a first instance and enriched in Ni by cation exchange processes. Newly precipitated minerals are kerolite-pimelite (7.84-23.54 wt% Ni) and then followed by Ni-free quartz. Minor amount of Nepouite (23.47-28.51 wt% Ni) occur in laths along shrinkage cracks of previously formed minerals, indicating a late stage paragenetic sequence. With emphasis on a hydrologic consideration, indicators of a preferential flow regime are identified in the garnierite-hosting regolith, including: (i) non-uniform pattern of the garnierite field occurrence, (ii) syn-weathering active nature of the garnierite-hosting structures, (iii) close relationship between the garnierite occurrence and vertical FeeMn oxides pipes as well as FeeMn oxides patched areas, and (iv) specific physico-chemical property of the garnierite location with higher organic matter concentrations but lower pH values compared to surroundings. It is proposed that the origin of garnierite is closely linked to a preferential flow of oversaturated solutions through accessible conduits in the regolith. Garnierite features as colloidal nature, high organic matter and low pH are key-parameters in metal transport and deposition.
关键词Garnierite Hydrologic Flow Regime Preferential Water Flow Ni Geochemistry Lateritic Ni Deposit
WOS标题词Science & Technology ; Physical Sciences
DOI10.1016/j.gexplo.2018.01.022
关键词[WOS]PREFERENTIAL FLOW ; NEW-CALEDONIA ; SOLID-SOLUTIONS ; SOIL CHEMISTRY ; EAST SULAWESI ; ORE-DEPOSITS ; WATER-FLOW ; NICKEL ; SUBSURFACE ; PATHS
收录类别SCI
语种英语
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000428134600019
引用统计
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5219
专题黄土与第四纪地质国家重点实验室(2010~)
作者单位1.Guilin Univ Technol, Guangxi Key Lab Hidden Metall Ore Deposits Explor, Guilin 541004, Peoples R China
2.Penn State Univ, Dept Ecosyst Sci & Management, University Pk, PA 16802 USA
3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China
4.Xian AMS Ctr, Shanxi Key Lab Accelerator Mass Spectrometry Tech, Xian 710061, Shaanxi, Peoples R China
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Fu, Wei,Zhang, Yinmeng,Pang, Chongjin,et al. Garnierite mineralization from a serpentinite-derived lateritic regolith, Sulawesi Island, Indonesia: Mineralogy, geochemistry and link to hydrologic flow regime[J]. JOURNAL OF GEOCHEMICAL EXPLORATION,2018,188(2018):240-256.
APA Fu, Wei.,Zhang, Yinmeng.,Pang, Chongjin.,Zeng, Xiangwei.,Huang, Xiaorong.,...&Lin, Henry.(2018).Garnierite mineralization from a serpentinite-derived lateritic regolith, Sulawesi Island, Indonesia: Mineralogy, geochemistry and link to hydrologic flow regime.JOURNAL OF GEOCHEMICAL EXPLORATION,188(2018),240-256.
MLA Fu, Wei,et al."Garnierite mineralization from a serpentinite-derived lateritic regolith, Sulawesi Island, Indonesia: Mineralogy, geochemistry and link to hydrologic flow regime".JOURNAL OF GEOCHEMICAL EXPLORATION 188.2018(2018):240-256.
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