HE-3 FROM THE MANTLE - PRIMORDIAL SIGNAL OR COSMIC DUST

被引：88
作者：
ANDERSON, DL
机构：
[1] Seismological Laboratory, California Institute of Technology, Pasadena
来源：
SCIENCE | 1993年 / 261卷 / 5118期
关键词：
D O I：
10.1126/science.261.5118.170
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：
Helium-3 in hotspot magmas has been used as unambiguous evidence for the existence of a primordial, undegassed reservoir deep in the Earth's mantle. However, a large amount of helium-3 is delivered to the Earth's surface by interplanetary dust particles (IDPs). Recycling of deep-sea sediments containing these particles to the mantle, and eventual incorporation in magma, can explain the high helium-3/helium-4 ratios of hotspot magmas. Basalts with high helium-3/helium-4 ratios may represent degassing of helium introduced by ancient (probably 1.5 to 2.0 billion years old) pelagic sediments rather than degassing of primordial lower mantle material brought to the surface in plumes. Influx of IDPs can also explain the neon and siderophile compositions of mantle samples.
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页码：170 / 176
页数：7
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