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Origin of Volatiles in Earth: Indigenous Versus Exogenous Sources Based on Highly Siderophile, Volatile Siderophile, and Light Volatile ElementsOrigin of Earth's volatiles has traditionally been ascribed to late accretion of material after major differentiation events - chondrites, comets, ice or other exogenous sources. A competing theory is that the Earth accreted its volatiles as it was built, thus water and other building blocks were present early and during differentiation and core formation (indigenous). Here we discuss geochemical evidence from three groups of elements that suggests Earth's volatiles were acquired during accretion and did not require additional sources after differentiation.
Document ID
20150002835
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Righter, K. (NASA Johnson Space Center Houston, TX, United States)
Danielson, L. (Jacobs Technology, Inc. Houston, TX, United States)
Pando, K. M. (Jacobs Technology, Inc. Houston, TX, United States)
Marin, N. (Arizona State Univ. Tempe, AZ, United States)
Nickodem, K. (Syracuse Univ. NY, United States)
Date Acquired
March 12, 2015
Publication Date
March 16, 2015
Subject Category
Geophysics
Lunar And Planetary Science And Exploration
Report/Patent Number
JSC-CN-32804
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: The Woodlands, TX
Country: United States
Start Date: March 16, 2015
End Date: March 20, 2015
Sponsors: Lunar and Planetary Inst., Universities Space Research Association, NASA Johnson Space Center
Distribution Limits
Public
Copyright
Public Use Permitted.

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