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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 |
DOI | 10.1016/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 |
推荐引用方式 GB/T 7714 | 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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