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Depletion and enrichment of subconti...

Zhang, Ming.

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Depletion and enrichment of subcontinental mantle in south China: A geochemical study of Cenozoic basalts and xenoliths.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Depletion and enrichment of subcontinental mantle in south China: A geochemical study of Cenozoic basalts and xenoliths./
作者:	Zhang, Ming.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1993,
面頁冊數:	141 p.
附註:	Source: Dissertation Abstracts International, Volume: 54-12, Section: B, page: 6103.
Contained By:	Dissertation Abstracts International54-12B.
標題:	Geochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9414888

Depletion and enrichment of subcontinental mantle in south China: A geochemical study of Cenozoic basalts and xenoliths.
Zhang, Ming.

Depletion and enrichment of subcontinental mantle in south China: A geochemical study of Cenozoic basalts and xenoliths. - Ann Arbor : ProQuest Dissertations & Theses, 1993 - 141 p.

Source: Dissertation Abstracts International, Volume: 54-12, Section: B, page: 6103.

Thesis (Ph.D.)--University of Illinois at Chicago, 1993.

Cenozoic lavas in Hainan Island comprise three rock types, i.e., quartz tholeiite, olivine tholeiite, and alkali basalt, which are usually interlayered. Relatively high degree of silica saturation is characteristic and in common with a 'pull-apart' tectonic setting.Subjects--Topical Terms:

539092
Geochemistry.

Depletion and enrichment of subcontinental mantle in south China: A geochemical study of Cenozoic basalts and xenoliths.
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245 1 0 $a Depletion and enrichment of subcontinental mantle in south China: A geochemical study of Cenozoic basalts and xenoliths.
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300 $a 141 p.
500 $a Source: Dissertation Abstracts International, Volume: 54-12, Section: B, page: 6103.
502 $a Thesis (Ph.D.)--University of Illinois at Chicago, 1993.
520 $a Cenozoic lavas in Hainan Island comprise three rock types, i.e., quartz tholeiite, olivine tholeiite, and alkali basalt, which are usually interlayered. Relatively high degree of silica saturation is characteristic and in common with a 'pull-apart' tectonic setting.
520 $a Alkali basalt and tholeiite show transitional relationship between each other in both element and isotopic ratios. The overall range of chemical variation is not likely the results of weathering, contamination, or crystal fractionation. But modeling results suggest that ratios of elements with bulk partition coefficients greater than that of Nb can be fractionated during partial melting. The commonly observed decoupled trace element-isotope relationships are explained as the results of melting fractionation upon the trace element ratios. Therefore, it is proposed that the mantle sources of basalts are depleted and coupled in both trace element (e.g., LREE) and isotopic (e.g., $\sp{143}$Nd/$\sp{144}$Nd) characteristics.
520 $a LILE/HFSE ratios in basalts are lower than primitive mantle values, conforming to depleted Sr and Nd isotopic compositions, but Sr and Pb isotopic ratios increase from alkali basalt to tholeiite suggesting addition of an EM2 component. Such compositional variation is consistent with contamination of a depleted OIB-like source by a subduction-related component.
520 $a Common geochemical features shared by Hainan and the South China Basin basalts suggest a geochemical domain beneath both continental and oceanic lithosphere in this region, probably in upper mantle, and this domain may have an ultimate origin from subduction occurred in Mesozoic. Compositions of basalts and xenoliths from eastern China suggest that formation of this upper mantle domain involved earlier subduction of harzburgitic oceanic lithosphere and subsequent conductive cooling and thickening of lherzolitic continental lithospheric mantle.
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