Boron and lithium isotopic signatures of nanometer-sized smectite-rich mixed-layers of bentonite beds from Campos Basin (Brazil)

Boron and lithium isotopic signatures of nanometer-sized smectite-rich mixed-layers of bentonite beds from Campos Basin (Brazil)
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坎波斯盆地(巴西)膨润土层纳米级富含蒙脱石的混合层的硼和锂同位素特征

DOI:
10.1007/s42860-022-00177-6
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发表时间:
2022
影响因子:
2.2
通讯作者:
Uysal, I. Tonguç
Uysal, I. Tonguç
中科院分区:
地球科学4区
文献类型:
--
作者:
Clauer, Norbert;Williams, Lynda B.;Uysal, I. Tonguç

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对在大西洋东南海岸(巴西)坎波斯盆地附近采集的两个桑顿期(85.8-83.5 Ma)膨润土样品的三种纳米尺寸(<20、20-50 和 50-100 nm)分离物中的硼和锂进行了分析。 B 和 Li 数据给出了各种趋势,表明由压倒性的蒙脱石和少于 9% 的伊利石层组成的分离物的不同结晶条件。其中一个样品中少数伊利石四面体位点的 δ11B 保持相当恒定,而其含量与 K 的含量严格相关,这表明伊利石化是通过与提供 K 的宿主沉积物的孔隙流体相互作用而进行的。在第二个样品中,来自两个较粗部分的伊利石层的 δ11B 表明早期火山起源,而较小尺寸的部分也与 沉积流体。受蒙皂石层八面体取代的青睐,δ7Li 受到火山连接的更严格调节。反过来,所研究的混合层中硼和锂同位素组成和含量的信息表明,富含蒙脱石的 I-S 中少数伊利石层的不同起源,这些伊利石层含有比含有更多锂的蒙脱石层更多的硼。这种差异似乎与样品位点和晶体尺寸有关,并由浊积岩的孔隙流体推动。
Boron and lithium were analyzed in three nanometer-sized (<20, 20-50 and 50-100 nm) separates of two Santonian (85.8-83.5 Ma) bentonite samples collected closely in the Campos Basin along the southeastern Atlantic coast (Brazil). The B and Li data give various trends that suggest varied crystallization conditions for separates that consist of overwhelming smectite with less than 9% illitic layers. The δ11B of the few illitic tetrahedral sites from one of the samples remains quite constant, while its contents are strictly correlated with those of K, which suggests that illitization proceeded by interaction with pore fluids of the host sediments that supplied the K. In the second sample, the δ11B of the illite layers from the two coarser fractions is indicative of an early volcanic origin, while the smaller size fraction also interacted with sedimentary fluids. Favored by octahedral substitutions of the smectite layers, the δ7Li is more strictly regulated by a volcanic link. In turn, the information of the B and Li isotopic compositions and contents from studied mixed-layers suggests a various origin for the few illite layers of the smectite-rich I-S that contain more B than the smectite layers that host more Li. The difference appears to be sample-site and crystal-size dependent, fueled by pore fluids of the hosting turbidites.
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