是火星地幔同构或异构和关于地幔对流这可以说什么?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 04 - 10 - t01:58:12z //www.hoelymoley.com/feeds/question/1044 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/1044 13 是火星地幔同构或异构和关于地幔对流这可以说什么? AlexLipp //www.hoelymoley.com/users/389 2014 - 05 - 29 - t10:53:42z 2015 - 01 - 07 - t02:49:15z < p >我的上司做了一个临时的评论,火星曾经有板块构造,并有证据表明火星曾经有板块构造,然而现在它不。她提到的理论是,火星是<强> < /强> heterogenoeous <强>或< /强>均匀,但是我忘记了哪一个她说!现在我找不到任何在线说哪一个!谁能帮帮我吗?< / p >

Also, the follow on from this was that this led to the ceasing of mantle convection which ended the possibilities of plate tectonics? Could somebody more knowledgable than I perhaps outline a theory of why this is?

In addition if mantle convection has ceased, than when do we think it stopped being active?

//www.hoelymoley.com/questions/1044/-/3179 # 3179 6 回答226868年HDE是火星地幔同构或异构和关于地幔对流这可以说什么? HDE 226868 //www.hoelymoley.com/users/1399 2015 - 01 - 03 - t02:01:11z 2015 - 01 - 07 - t02:29:05z < p >火星地幔是异构的。虽然有很多未知的事情关于火星的火星地幔和整个内部结构,这不是其中之一。这一发现的来源来自于陨石的分析来自火星。< / p >

Analysis shows that 4.5 billion years ago - when Mars was forming along with the rest of the solar system - two distinct "reservoirs" formed in the mantle - the "Enriched Reservoir" (ER) and the "Depleted Reservoir" (DR). The ER had high ratios of lanthanum/ytterbium and $^{87}$Sr/$^{86}$Sr, and a low ratio of samarium/neodymium. The DR had the opposite ratios.

Eventually, meteorites known as shergottites formed, mixtures of both of these reservoirs. A graph (which I'd insert here, but I'm unsure of the copyright on it) entitled "Heterogeneous Martian Mantle" illustrates how these meteorites have a wide range of composition compared to rocks from Earth. This provides compelling evidence for a heterogeneous Martian mantle.

At the moment, I can't find enough information to answer the follow-up part, though the convection certainly did stop.


Sources:

PSRD article 1

PSRD article 2

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