Preliminary discussions on the rejuvenated metallogenesis of the Da HingganMongolia Paleozoic orogenic belt as deduced from the studies on Sn, W and Mo-polymetallic deposits occurring within the Xilinhot and Ergun Massifs

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	Preliminary discussions on the rejuvenated metallogenesis of the Da HingganMongolia Paleozoic orogenic belt as deduced from the studies on Sn, W and Mo-polymetallic deposits occurring within the Xilinhot and Ergun Massifs
	Nie FengJun 2; Cao Yi ; Ding ChengWu ; Liu YiFei
刊名	ACTA PETROLOGICA SINICA
	2014
卷号	30 期号:7 页码:2063-2080
关键词	Sn W and Mo-polymetrallic deposits Reworking Reactivation Rejuvenated metallogeny Mesozoic granitoid intrusions Xilinhot massif Ergun massif Da Hinggan-Mongolia orogenic belt
ISSN号	1000-0569
英文摘要	Precambrian metamorphic intermediate massifs are widely distributed in the Da Hinggan-Mongolia Paleozoic orogenic belt, among which the Xilinhot and Ergun massifs are the largest ones, and show a complex rejuvenation history. Mineral exploration and regional metallogenic studies show that Sn-, W-and Mo-polymetallic deposits are well developed both in the Xilinhot and Ergun massifs, and can be classified into five types in term of their host rocks and metallogenic features. They are (1) porphyry type Sn, W (Mo) and Cu (Mo) deposits; (2) skarn type Sn-Fe and Sn-Ag-Cu deposits; (3) shallow-emplaced granitoid intrusive dykes (swarms) -related vein type Sn, Wand Mo-W deposits; (4) deep-seated emplaced granitoid intrusive stocks (batholiths)-related vein type Sn, W and Mo deposits; (5) felsic volcanic type Sn deposits. Among all the five type deposits, the first two bear the most important economic significance. It has been noted that Sn-, W-and Mo-polymetallic mineralization occurs within the Precambrian metamorphic massifs, but they have an intimate spatial and temporal relationship with Mesozoic granitoid intrusions. In general, Sn, W and Mo are considered as the continent-affiliation elements, while Cu, Ni, Au and PGE are derived from the mantle-relate magmatic and its related or hydrothermal sources. Preliminary studies show that the rejuvenation of pre-existing crust and lithosphere or/and mantle may be the important factor for the regional metallogenesis of Sn-, W-and Mo-polymetallic deposits occurring within the Xilinhot and Erg-un intermediate massifs. The rejuvenation occurs largely via two related processes: reactivation and re-working. The reactivation is normally considered to involve the rejuvenation of discrete structures, whilst reworking involves the repeated focusing of metamorphism, deformation and magmatism into the same crustal-or lithospheric-scale volume. Melting of existing continental lithosphere (mantle) is a dramatic thermal expression of reworking. However, the emplacement of the granitoid magma commonly exploits pre-existing structures and may promote transient fault weakening during emplacement. Thus the vastly different processes of magma generation (reworking) and emplacement (reactivation) are both essentially expressions of the thermal rejuvenation of existing continental lithosphere. Our Nd-Sr-Pb isotopic studies show that the ore-forming materials, dynamic force and fluids may be provided by the Mesozoic granitoid magma. Moreover, the accumulation conditions of the ore-forming materials were given by the reactivation of previous-exist faults and fracture zones. The Mesozoic lithosphere stretching and asthenosphere upwelling may result in the reworking of continental crust (Precambrian metamorphic intermediate massifs) and primitive crust (previously formed mafic igneous rocks with positive sNd t) and Hf(t) values), and then produced Sn-, W-, and Mo-rich granitoid magma. When the magma moved along reactivated structures developed within the Precambrian metamorphic intermediate massifs, ore-bearing fluids derived from condensation fraction of the granitoid magma filled the structures and replaced country rock, thus forming the Sn-, W-, and Mo-polymetallic deposits. Therefore, it is believed that the all the deposits are the products of the Mesozoic intraplate granitoid magmatic occurring in the Xilinhot and Ergun intermediate massifs. Moreover, the intensive superimposition of the Mesozoic tectono-magmatic events and the Precambrian metamorphic massifs may greatly upgrade the enrichment of the Sn-, W-and Mo-polymetallic elements. The rejuvenated metallogenic model and mineral exploration criteria of the Sn, W and Mo-polymetallic deposits can also be used as useful tool during the comprehensive evaluation of concealed deposits in the Da Hinggan-Mongolia Paleozoic orogenic belt.
学科主题	矿床地质
WOS关键词	INNER-MONGOLIA ; NE CHINA ; MINERALIZATION ; GEOCHRONOLOGY ; GEOCHEMISTRY ; ROCKS
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000339456100019
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40439]
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 Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China 2.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Nie FengJun,Cao Yi,Ding ChengWu,et al. Preliminary discussions on the rejuvenated metallogenesis of the Da HingganMongolia Paleozoic orogenic belt as deduced from the studies on Sn, W and Mo-polymetallic deposits occurring within the Xilinhot and Ergun Massifs[J]. ACTA PETROLOGICA SINICA,2014,30(7):2063-2080.
APA	Nie FengJun,Cao Yi,Ding ChengWu,&Liu YiFei.(2014).Preliminary discussions on the rejuvenated metallogenesis of the Da HingganMongolia Paleozoic orogenic belt as deduced from the studies on Sn, W and Mo-polymetallic deposits occurring within the Xilinhot and Ergun Massifs.ACTA PETROLOGICA SINICA,30(7),2063-2080.
MLA	Nie FengJun,et al."Preliminary discussions on the rejuvenated metallogenesis of the Da HingganMongolia Paleozoic orogenic belt as deduced from the studies on Sn, W and Mo-polymetallic deposits occurring within the Xilinhot and Ergun Massifs".ACTA PETROLOGICA SINICA 30.7(2014):2063-2080.