亏损上地幔中的富钾熔体和碳酸盐交代作用: 来自CCSD预先导孔橄榄岩的地球化学证据

李天福; 杨经绥; 张儒媛

Volume 31 Issue 4

Jul. 2006

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Article Navigation > Earth Science > 2006 > 31(4): 457-474

LI Tian-fu, YANG Jing-sui, ZHANG Ru-yuan, 2006. K-Rich and Carbonatic Melt Metasomatism in Depleted Upper Mantle: Geochemical Evidences from Peridotites in Pre-Pilot Hole of Chinese Continental Scientific Drilling Project. Earth Science, 31(4): 457-474.

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K-Rich and Carbonatic Melt Metasomatism in Depleted Upper Mantle: Geochemical Evidences from Peridotites in Pre-Pilot Hole of Chinese Continental Scientific Drilling Project

1.
Key Laboratory for Continental Dynamics of the Ministry of Land and Resources of China, Beijing 100037, China
2.
Department of Geological and Environmental Sciences, Stan ford University, Stan ford, California 94305, USA

Received Date: 2006-06-02
Publish Date: 2006-07-25

Abstract

Abstract

The Chinese pre-pilot hole (PP1) is located at Zhimafang Village,Donghai County in the Sulu UHP terrane,east China. Ultrahigh-pressure peridotites of 115 m thick within gneiss recovered from the PP1 are composed of abundant lherzolite,harzburgite,and minor wehrlite and dunite. Peridotite near to the contacts with gneiss is strongly serpentinized. More than 90 vol% peridotites contain garnet and phlogopite; some contain magnesite and Ti-clinohumite. All peridotites contain lower "fertile elements" compared with primitive mantle,their Mg# numbers range from 90.3 to 92.6,and MgO content (36.61%-49.15%,averagely 45.17%) has negative correlation with Na₂O (0.01%-0.25%),Al₂O₃ (0.07%-3.71%,most < 2.0%,averagely 1.46%) and CaO (0.12%-2.53%,one up to 3.30%,averagely 1.00%) contents. In contrast to major element depletion feature,the PP1 peridotites show light rare earth element-enriched and slight to moderately fractionated REE pattern of nearly parallel curves and roughly identical pattern with (La/Lu) _N ratios of 3.18-33.05. Most of the peridotites contain high Ba (higher than 92 times of primitive mantle) and LREE and low HFSE,and are characterized by negative Rb,Nb,Ta,Zr,Hf and Sr anomalies (e.g.,C39-157-81) in spidergrams. Ti/Eu ratios are lower than ca. 1 300. The lack of correlation between refractory degree and enrichment of incompatible elements documents effect by metasomatism after mantle melting. Petrographic characteristics show multiple metasomatism of phlogopite and magnesite. Phl-rich peridotites (such as samples C25-143-61,C32-149-71) have the K₂O enrichment trend and good correlations between K₂O and some LILE such as Rb,Ba and Th. No positive correlations between K₂O and REE and between Sr and Ca are seen. These signatures show that peridotites were metasomatised by hydrous,silicic,aluminous and alkaline melts containing some LILE,and then severely overprinted by metasomatism of magnesite melt containing high Ba and low Rb and HFSE which modified Ba content drastically and endued REE patterns of mantle carbonatite melt. Whole rock has heterogeneously high radiogenic Sr (87 Sr/86 Sr=0.708 4-0.720 1) and low radiogenic Nd (ε_ Nd (t) =-1.14 to-8.55),which indicates the peridotites from PP1 hole was probably derived from long-term enriched mantle by agents from depth,especially combined with oxygen isotope compositions of anhydrous and hydrous minerals reported by previous studies.
- garnet peridotite,
- trace element,
- mantle depletion,
- metasomatism,
- Chinese Continental Scientific Drilling Project

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References(56)

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