Effect of crustal porosity on lunar magma ocean solidification  

作　　者：Mingming Zhang Yingkui Xu Xiongyao Li 

机构地区：[1]Center for Lunar and Planetary Sciences,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China [2]University of Chinese Academy of Sciences,Beijing 100040,China [3]CAS Center for Excellence in Comparative Planetology,Hefei 230026,China

出　　处：《Acta Geochimica》2021年第2期123-134,共12页地球化学学报（英文）

基　　金：financially supported by the National Natural Science Foundation of China (Grants Nos. 41773064, 41931077);the Strategic Priority Program of the Chinese Academy of Sciences (No. XDB41020300);Youth Innovation Promotion Association of CAS, the Key Research Program of the Chinese Academy of Sciences (XDPB11);Beijing Municipal Science and Technology Commission (Z181100002918003)。

摘　　要：The lunar ferroan anorthosites,formed by plagioclase flotation from the crystallization of the lunar magma ocean,have an age span of over~200 Ma.However,previous thermal models predicted a much shorter time range.We propose that a much smaller thermal conductivity of anorthositic crust due to its high porosity may have delayed the solidification of the lunar magma ocean.Our thermal simulation results,using the thermal conductivity of porous lunar crust,show that crystallization of a 1000 km deep magma ocean could be prolonged to tens of millions of years,and up to 180 Ma under some extreme conditions.The porous crust alone can’t explain the large crustal age span,however.Other circumstances must be taken into consideration,such as a thick lunar soil.

关 键 词：POROSITY Thermal evolution Ferroan anorthosites 

分 类 号：P184[天文地球—天文学]