Delineation of regional geochemical anomalies penetrating through thick;cover in concealed terrains - a case history from the Olympic Dam;deposit, Australia

doi:10.1016/S0375-6742(99)00036-9

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	Delineation of regional geochemical anomalies penetrating through thick;cover in concealed terrains - a case history from the Olympic Dam;deposit, Australia
	Wang, XQ; Xie, XJ; Cheng, ZZ; Liu, DW
刊名	JOURNAL OF GEOCHEMICAL EXPLORATION
	1999
卷号	66 期号:1-2 页码:85-97
关键词	penetration regional anomaly NAMEG MOMEO Olympic Dam deposit
ISSN号	0375-6742
DOI	10.1016/S0375-6742(99)00036-9
英文摘要	A regional orientation survey using NAMEG (nanoscale metals in earthgas) and MOMEO (mobile forms of metals in overburden) methods was carried out across the Olympic Dam Cu-U-Au-Ag deposit. Thirty-six sites were sampled in an area of 2500 km(2). At each site, two sample types, earthgas and soil, were collected. Over twenty elements in earthgas samples were determined by INAA. The soil samples were processed by sequential MOMEO leaching for water-extractable metals, adsorbed and exchangeable metals, and occluded metals onto Fe and Mn oxides. Ten elements in each phase were determined by AAS, GF-AAS and HG-AFS. Regional anomalies of Au, Hg, Ir and Ta in earthgas, water-extractable Cu, Au and Hg, and adsorbed Cu, are consistent: with the deposit. The highest values of Au, Hg, Ir, and Ta in earthgas, water-extractable Hg and adsorbed Cu occur directly over the deposit. The water-extractable Cu and Au anomalies around the Olympic Dam have a greater contrast than those in other forms. These results show that the NAMEG and MOMEO techniques can penetrate a thick sequence of post-mineralization rocks overlain by deeply weathered overburden and give a clear expression of concealed deposits where conventional surface geochemical methods are not likely to be used. The patterns also show that this giant ore deposit has a tremendous endowment of metals which can generate large-scale superimposed geochemical anomalies up to and including the surface. The resulting broad geochemical pattern is detectable by low-density sampling coupled with ultra-sensitive analytical methods. (C) 1999 Elsevier Science B.V. All rights reserved.
学科主题	地球化学勘查
WOS关键词	MOBILE FORMS ; EXPLORATION ; OVERBURDEN ; METALS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000081683100008
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37372]
专题	中国地质调查局发展研究中心
作者单位	Inst Geophys & Geochem Explorat, Langfang 065000, Hebei, Peoples R China.
推荐引用方式 GB/T 7714	Wang, XQ,Xie, XJ,Cheng, ZZ,et al. Delineation of regional geochemical anomalies penetrating through thick;cover in concealed terrains - a case history from the Olympic Dam;deposit, Australia[J]. JOURNAL OF GEOCHEMICAL EXPLORATION,1999,66(1-2):85-97.
APA	Wang, XQ,Xie, XJ,Cheng, ZZ,&Liu, DW.(1999).Delineation of regional geochemical anomalies penetrating through thick;cover in concealed terrains - a case history from the Olympic Dam;deposit, Australia.JOURNAL OF GEOCHEMICAL EXPLORATION,66(1-2),85-97.
MLA	Wang, XQ,et al."Delineation of regional geochemical anomalies penetrating through thick;cover in concealed terrains - a case history from the Olympic Dam;deposit, Australia".JOURNAL OF GEOCHEMICAL EXPLORATION 66.1-2(1999):85-97.