Evolution of the continents and the atmosphere inferred from Th-U-Nb systematics of the depleted mantle

被引：183

作者：

Collerson, KD ^{[1
]}

Kamber, BS ^{[1
]}

机构：

[1] Univ Queensland, Dept Earth Sci, Brisbane, Qld 4072, Australia

来源：

SCIENCE | 1999年 / 283卷 / 5407期

关键词：

D O I：

10.1126/science.283.5407.1519

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Temporal evolution of depleted mantle thorium-uranium-niobium systematics constrain the amount of continental crust present through Earth's history (through the niobium/thorium ratio) and date formation of a globally oxidizing atmosphere and hydrosphere at approximately 2.0 billion years ago (through the niobium/uranium ratio). increase in the niobium/thorium ratio shows involvement of hydrated lithosphere in differentiation of Earth since approximately 3.8 billion years ago. After approximately 2.0 billion years ago, the decreasing mantle thorium/uranium ratio portrays mainly preferential recycling of uranium in an oxidizing atmosphere and hydrosphere. Net growth rate of continental crust has varied over time, and continents are still growing today.

引用

页码：1519 / 1522

页数：4

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