揚(yáng)子板塊北緣下志留統(tǒng)龍馬溪組重晶石結(jié)核特征及其成因機(jī)制分析
發(fā)布時(shí)間：2018-08-19 09:31
【摘要】：在揚(yáng)子板塊北緣城口明中剖面及巫溪徐家壩剖面下志留統(tǒng)龍馬溪組底部的硅質(zhì)巖、泥巖中發(fā)現(xiàn)橢球狀重晶石結(jié)核。其礦物組成主要為重晶石顆粒與作為"基質(zhì)"的黃鐵礦、粘土礦物和石英。通過重晶石巖石學(xué)、礦物學(xué)及鍶同位素分析表明,重晶石結(jié)核形成于早期成巖階段松軟沉積物的孔隙水中。上升洋流帶來豐富的營養(yǎng)及富鋇物質(zhì),表層海水的高初始生產(chǎn)力促使生物繁盛,海水中的鋇通過生物作用富集形成生物鋇,生物鋇(bio-barite)在埋藏過程中的硫酸鹽耗竭區(qū)(sulfate depleted zones)通過硫酸鹽細(xì)菌作用(BSR)溶解被激活提供了鋇的來源。圍巖巖性(黑色泥巖和硅質(zhì)泥巖)表明重晶石結(jié)核形成于缺氧的環(huán)境中。上述研究對深入理解早志留世時(shí)期揚(yáng)子板塊北緣古海洋環(huán)境有一定的啟示作用。
[Abstract]:The ellipsoid barite nodules were found in the siliceous rocks at the bottom of the Longmaxi formation in the lower Silurian in the Chengkou and Xujiaba sections of the northern margin of the Yangtze plate. Its mineral composition is mainly barite particles and pyrite, clay minerals and quartz as "matrix". Barite petrology mineralogy and strontium isotope analysis indicate that barite nodules were formed in the pore water of soft sediments in early diagenetic stage. The rising ocean currents bring abundant nutrients and barium rich materials. The high initial productivity of the surface seawater promotes the biological prosperity, and the barium in the sea water is enriched by biological action to form biological barium. The (sulfate depleted zones) in the sulfate depletion zone during the burial of biological barium (bio-barite) provides a source of barium through the activation of (BSR) solution by sulfate bacteria. The lithology of surrounding rock (black mudstone and siliceous mudstone) indicates that barite nodules were formed in anoxic environment. These studies are helpful to understand the paleo-marine environment in the northern margin of the Yangtze plate during the early Silurian period.
【作者單位】： 油氣藏地質(zhì)及開發(fā)工程國家重點(diǎn)實(shí)驗(yàn)室成都理工大學(xué);成都理工大學(xué)能源學(xué)院;成都理工大學(xué)地球科學(xué)學(xué)院;
【基金】：中國地質(zhì)調(diào)查項(xiàng)目(121220115003801-04)~~
【分類號】：P578.71
[Abstract]:The ellipsoid barite nodules were found in the siliceous rocks at the bottom of the Longmaxi formation in the lower Silurian in the Chengkou and Xujiaba sections of the northern margin of the Yangtze plate. Its mineral composition is mainly barite particles and pyrite, clay minerals and quartz as "matrix". Barite petrology mineralogy and strontium isotope analysis indicate that barite nodules were formed in the pore water of soft sediments in early diagenetic stage. The rising ocean currents bring abundant nutrients and barium rich materials. The high initial productivity of the surface seawater promotes the biological prosperity, and the barium in the sea water is enriched by biological action to form biological barium. The (sulfate depleted zones) in the sulfate depletion zone during the burial of biological barium (bio-barite) provides a source of barium through the activation of (BSR) solution by sulfate bacteria. The lithology of surrounding rock (black mudstone and siliceous mudstone) indicates that barite nodules were formed in anoxic environment. These studies are helpful to understand the paleo-marine environment in the northern margin of the Yangtze plate during the early Silurian period.
【作者單位】： 油氣藏地質(zhì)及開發(fā)工程國家重點(diǎn)實(shí)驗(yàn)室成都理工大學(xué);成都理工大學(xué)能源學(xué)院;成都理工大學(xué)地球科學(xué)學(xué)院;
【基金】：中國地質(zhì)調(diào)查項(xiàng)目(121220115003801-04)~~
【分類號】：P578.71
【參考文獻(xiàn)】
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