重晶石和Acantharians -地球科学堆栈交换江南体育网页版江南电子竞技平台 最近30从www.hoelymoley.com 2023 - 07 - 09 - t18:53:15z //www.hoelymoley.com/feeds/question/416 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/416 12 重晶石和Acantharians plannapus //www.hoelymoley.com/users/87 2014 - 04 - 22 - t08:19:10z 2014 - 10 - 11 - t09:26:23z < p > Acantharians是浮游原生生物(丰富的海洋在今天),姐妹团队polycystine放射虫,在硫酸锶biomineralizing复杂的骨架的特殊性SrSO 4 <子> < /订阅>(即塞莱斯廷)。这些原生生物没有(据我所知)化石记录的理由塞莱斯廷是溶于海水一旦生物腐烂。但是它一直猜测(e . g。<强>伯恩斯坦et al . 1992 < /强>),acantharian-derived塞莱斯廷可能在原点Sr-rich重晶石的形成。< / p > < p >这一假设的地位是什么?如果这仍然被认为是真的,有办法区分明确acantharian-derived重晶石从其他类型的重晶石?< / p > < p >这当然会有趣的古生物学的影响。< / p > < p > <子>来源:< br >伯恩斯坦,r E。伯恩,r . H。贝茨,p R。希腊,a . M。,1992年。< a href = " http://www.sciencedirect.com/science/article/pii/0016703792903042 " rel =“nofollow”>形态和转换的天青石海水:acantharians锶和钡的作用地球化学< / >。Geochimica et Cosmochimica学报,56:3273 - 3279。< /子> < / p > //www.hoelymoley.com/questions/416/-/2609 # 2609 3 通过对重晶石和Acantharians user889回答 user889 //www.hoelymoley.com/users/0 2014 - 10 - 10 - t18:46:32z 2014 - 10 - 10 - t18:46:32z < p >仍有一些不确定性,但最近的一些研究详细如下:< / p > < p >在本文研究发表在< a href = " http://pmc.ucsc.edu/ ~ apaytan /出版物/ 2012 _articles /格里菲斯% 202012. pdf”rel =“nofollow”>重晶石海洋中发生,地球化学和palaeoceanographic应用< / >(格里菲斯和Paytan, 2012),最近的观察和研究发现,< / p > < blockquote > < p >老使用非碳酸盐含量悬浮粒子跟踪棘骨虫亚纲的存在,凡发现et al .(2007)表明,acantharian解散并贡献明显——斜面重晶石形成上500米的水柱< / p > < /引用> < p >然而,缺乏一个明确的重晶石浓度之间的相关性和acantharian分布表明,< / p > < blockquote > < p >这些生物不需要对重晶石的形成水柱(伯特伦,科恩,1997)< / p > < /引用> < p >,进一步观察< / p > < blockquote > < p >提供直接证据来支持海洋重晶石的水柱微环境机制形成和验证重晶石可以形成在棘骨虫亚纲的缺失。< / p > < /引用>

The concentration of strontium in barite is a record of the Sr isotopic composition of the formation fluids, which according to the article has its source from sea water, sediments (both marine and terrigenous) and hydrothermal fluids.

It is this last point, particularly about the Sr concentrations in sea-water, which according to the article Sedimentation of acantharian cysts in the Iceland Basin: Strontium as a ballast for deep ocean particle flux, and implications for acantharian reproductive strategies (Martin et al. 2010) state can fluctuate by several percent

By precipitating celestite, Acantharia can reduce surface seawater strontium (Sr) concentrations by up to 5%

Experimentally the authors found that

Sr fluxes we report are too high to be attributed to nonacantharian sources.
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