Geochemical Modeling of Nb-Ta-La Fractionation in TTG Suite: Constraints on Archean Plate Subduction and Continental Crust Growth
详细信息
- 责任者：Cheng Suhua (School of Earth Sciences and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Wang Yang
- 刊名：Geotectonica et Metallogenia
- 出版年：2011
- 卷期：35(1)
- 关键词：同位素分馏作用 ; isotope fractionation ; 英云闪长岩 ; tonalite ; 奥长花岗岩 ; trondhjemite ; 花岗闪长岩 ; granodiorites
- 页码：p.95-104
- 图表：4 illus., 1 table, 48 refs.
- 分类号：0801
- issnNo：ISSN1001-1552
- isbnNo：CN44-1595/P
摘要
In this paper, trace element partition coefficients of rutile and low-Mg# amphibole from recent experiments are used to model Nb-Ta-La fractionation during partial melting of basaltic rocks. The geochemical modeling shows that: the melt is characterized by 1) lower Nb/Ta ratio (relative to that of primitive mantle) without Ta depletion (relative to La) for partial melting system with rutile-free garnet amphibolite residuum; and 2) Nb and Ta depletions as well as higher Nb/Ta ratio for partial melting system with rutile-bearing eclogite residuum. Thus, the authors suggest that the residuum of TTG melt is amphibole eclogite bearing rutile and low-Mg# amphibole.
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