什么是第四纪的构造影响Igwisi山,坦桑尼亚,金伯利岩火山岩吗?- 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 - 07 - 09 - t00:42:57z //www.hoelymoley.com/feeds/question/2888 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/2888 8 什么是第四纪的构造影响Igwisi山,坦桑尼亚,金伯利岩火山岩吗? user889 //www.hoelymoley.com/users/0 2014 - 11 - 23 - t09:47:05z 2015 - 11 - 27 - t18:34:19z < p > Igwisi山金伯利岩火山地貌在坦桑尼亚在文章中描述了< a href = " http://gef.nerc.ac.uk/documents/reports/894。pdf nofollow noreferrer“rel = >映射Igwisi山金伯利岩火山,坦桑尼亚:了解deep-sourced地幔岩浆特征表现在地球表面的< / >(布朗和火花),是第四纪或年轻的年龄和符合我之前的问题和答案,< a href = " //www.hoelymoley.com/questions/2509/what-is-it-about-ancient-craton-geology-that-results-in-associated-kimberlite-pi " >是什么古代克拉通地质结果相关的金伯利岩管包含经济钻石存款?< / >,爆发通过< a href = " http://en.wikipedia.org/wiki/Tanzania_Craton " rel = " nofollow noreferrer " >坦桑尼亚克拉通< / >。< / p >

The article Tectonic setting of kimberlites (Jelsma et al. 2009) has made correlations between older kimberlite volcanics and aspects of the supercontinent cycle, specifically:

Kimberlites can be viewed as time capsules in a global plate tectonic framework. Their distribution illustrates clustering in time and space. Kimberlite ages span the assembly and break-up of a number of supercontinents, such as Rodinia and Gondwana. These supercontinents show time lines with (i) broad periods devoid of kimberlite magmatism corresponding to times of continent stability, and (ii) narrow kimberlite emplacement windows corresponding to times of fundamental plate reorganizations.

Implying a link between parts of the supercontinent cycle and kimberlite magmatism.

However, this implied tectonic setting does not seem to match with Quaternary Tanzania, when the Igwisi Hills kimberlite volcanoes erupted. Therefore, what are the tectonic implications of the Quaternary Igwisi Hills, Tanzania, kimberlite volcanics?

The only thing that comes to mind is the East African Rift tectonics, but are not sure about this link.

//www.hoelymoley.com/questions/2888/-/2919 # 2919 5 user889回答的是什么第四纪的构造影响Igwisi山,坦桑尼亚,金伯利岩火山岩吗? user889 //www.hoelymoley.com/users/0 2014 - 11 - 28 - t11:05:18z 2014 - 11 - 29 - t12:01:45z < p > Igwisi山金伯利岩爆发在太古代坦桑尼亚克拉通岁居住在东方和西方之间的东非大裂谷(< a href = " http://onlinelibrary.wiley.com/doi/10.1029/2002JB002273/full " rel =“nofollow”> 1 < / >),附近的格里高利裂谷(< a href = " http://link.springer.com/article/10.1007%2FBF00310913 " rel =“nofollow”> 2 < / >)。它是一系列3火山,证据表明,这些爆发是由于体积小无性生殖的喷发(< a href = " http://research-information.bristol.ac.uk/en/publications/eruption-of-kimberlite-magmas-physical-volcanology-geomorphology-and-age-of-the-youngest-kimberlitic-volcanoes-known-on-earth-the-upper-pleistoceneholocene-igwisi-hills-volcanoes-tanzania (cd277b49 - 99 - ee - 43 - ca - 8 cd4 - 515 - b38db21be)。html " rel = " nofollow”> 3 < / >)。< / p >

Seismic studies and observations detected that the cratonic lithosphere base is approximately 170km, after which, there is anomalously low velocities to a depth of about 350km (1), which according to models described by Weeraratne et al. (1) indicate that beneath the cratonic crust, there is the presence of high temperature and the presence of melt:

  • a transition to a younger 'more fertile' asthenosphere.
  • crucially in terms of the local tectonics, indicate the presence of a mantle plume head causing the craton to experience uplift.

The mineralogy of xenoliths in the pyroclasts and lava further indicate that there has been small degrees of carbonate-apatite bearing peridotite source melts from depths greater than 110km. (2)

Brown et al. (3) conclude that the fact that these kimberlitic volcanics are so comparatively young, they may indicate that a new phase of kimberlite activity may be starting in the Tanzanaian craton, especially when considering the mantle plume and active rifting in the adjacent East Africa Rift branches. This suggests that a link between kimberlite volcanism and the supercontinent cycle maybe too much of a simplistic view, when the reality is probably closer to individual plate reorganisation (in this case, the eventual splitting of the African continent).

References

(1) Weeraratne et al. 2003, Evidence for an upper mantle plume beneath the Tanzanian craton from Rayleigh wave tomography, Journal and Geophysical Research.

(2) Dawson, 1994, Quaternary kimberlitic volcanism on the Tanzania Craton, Contributions to Mineralogy and Petrology (abstract only - paywalled)

(3) Brown et al. 2012, Eruption of kimberlite magmas: physical volcanology, geomorphology and age of the youngest kimberlitic volcanoes known on earth (the Upper Pleistocene/Holocene Igwisi Hills volcanoes, Tanzania), Explore Bristol Research (abstract only - paywalled)

//www.hoelymoley.com/questions/2888/-/6995 # 6995 1 由奥利弗·L回答什么是第四纪的构造影响Igwisi山,坦桑尼亚,金伯利岩火山岩吗? 奥利弗·L //www.hoelymoley.com/users/4896 2015 - 11 - 27 - t18:34:19z 2015 - 11 - 27 - t18:34:19z < p >金伯利岩通常与失败有关裂缝为岩浆提供了一种方法到达地表。< / p > < p >的钻石协会老克拉通,你必须了解这个道理,钻石需要特殊条件的压力和温度。当你沿着地幔上升的压力和温度上升因此但形成和保存钻石需要高压但温度低于通常与这样的压力有关。老克拉通厚,冷的岩石圈根,有时打开窗户的钻石与正确的压力和温度稳定性。< / p >
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