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黔北鎮(zhèn)遠(yuǎn)牛蹄塘組黑色頁巖沉積環(huán)境與有機(jī)質(zhì)富集關(guān)系

發(fā)布時(shí)間:2024-04-20 10:33
  通過礦物組分、主量元素、微量元素、碳氧同位素等特征,分析了黔北地區(qū)鎮(zhèn)遠(yuǎn)縣ZX井牛蹄塘組黑色頁巖的巖相類型和不同巖相頁巖的沉積環(huán)境及其與有機(jī)質(zhì)富集間的關(guān)系。結(jié)果表明,牛蹄塘組下段以硅質(zhì)頁巖為主,TOC含量4.96%~10.10%;上段以富泥硅質(zhì)頁巖為主,TOC含量1.43%~9.04%。下段硅質(zhì)頁巖沉積于水流停滯的深水陸棚環(huán)境,沉積古水體為貧氧的還原狀態(tài);上段富泥硅質(zhì)頁巖沉積時(shí)期,仍為貧氧的還原環(huán)境,但水體滯留程度、還原性較下段硅質(zhì)頁巖沉積期弱。貧氧的還原環(huán)境是影響牛蹄塘組黑色頁巖有機(jī)質(zhì)富集的主要因素,熱液作用和陸源碎屑對牛蹄塘組黑色頁巖有機(jī)質(zhì)富集的影響較小。

【文章頁數(shù)】:10 頁

【部分圖文】:

圖1埃迪卡拉紀(jì)-寒武紀(jì)轉(zhuǎn)折期揚(yáng)子陸塊古地理圖??(改自?Yeasmin?et?al.,2017)??Fig.?1?Synthesized?paleogeographic?map?of?the??-

圖1埃迪卡拉紀(jì)-寒武紀(jì)轉(zhuǎn)折期揚(yáng)子陸塊古地理圖??(改自?Yeasmin?et?al.,2017)??Fig.?1?Synthesized?paleogeographic?map?of?the??-

礦物、黏土礦物含量,??可將頁巖劃分為硅成鼠營?、鈣質(zhì)頁譽(yù)、黏土質(zhì)頁巖和??:混合頁巖4種主荽巖相.類型9硅質(zhì)頁苕可細(xì)分為詿??質(zhì)頁巖、富泥旌質(zhì)麗巖、鬣鈣硅質(zhì)頁巖、富鈣/m跬質(zhì)??頁巖;鈣質(zhì)頁菪可細(xì)分為鈣質(zhì)頁巖、甯泥鈣質(zhì)頁巖、??富硅鈣質(zhì)頁巖、富泥/硅鈣質(zhì)頁'巖¥黏玉賡3T巖可細(xì)....


圖1埃迪卡拉紀(jì)-寒武紀(jì)轉(zhuǎn)折期揚(yáng)子陸塊古地理圖??(改自?Yeasmin?et?al.,2017)??Fig.?1?Synthesized?paleogeographic?map?of?the??Yangtze??

圖1埃迪卡拉紀(jì)-寒武紀(jì)轉(zhuǎn)折期揚(yáng)子陸塊古地理圖??(改自?Yeasmin?et?al.,2017)??Fig.?1?Synthesized?paleogeographic?map?of?the??Yangtze??

礦物、黏土礦物含量,??可將頁巖劃分為硅成鼠營?、鈣質(zhì)頁譽(yù)、黏土質(zhì)頁巖和??:混合頁巖4種主荽巖相.類型9硅質(zhì)頁苕可細(xì)分為詿??質(zhì)頁巖、富泥旌質(zhì)麗巖、鬣鈣硅質(zhì)頁巖、富鈣/m跬質(zhì)??頁巖;鈣質(zhì)頁菪可細(xì)分為鈣質(zhì)頁巖、甯泥鈣質(zhì)頁巖、??富硅鈣質(zhì)頁巖、富泥/硅鈣質(zhì)頁'巖¥黏玉賡3T巖可細(xì)....


圖4?ZX井牛蹄塘組頁巖主量元素(a)、微量元素(b)分布??Fig.?4?Major?elements?(a)?and?trace?elements?(b)?of?Niutitang?shale?at?well?ZX??

圖4?ZX井牛蹄塘組頁巖主量元素(a)、微量元素(b)分布??Fig.?4?Major?elements?(a)?and?trace?elements?(b)?of?Niutitang?shale?at?well?ZX??

8??1??99??SL??S12??780.?88??44??26??7??7??10??8.?63??40??60??SL??S13??787.?18??75??8??7??10??8.?01??37??63??SL??S14??791.?41??49??27??6??4??....


圖5?ZX井牛蹄塘組頁巖主量元素(a)、微量元素(b)組合關(guān)系判斷熱水沉積??Fig.?5?Relationship?of?different?major?elements?groups?(a)?and?trace?element?groups?(b)?of?Niutitang?shale?at?well?ZX??

圖5?ZX井牛蹄塘組頁巖主量元素(a)、微量元素(b)組合關(guān)系判斷熱水沉積??Fig.?5?Relationship?of?different?major?elements?groups?(a)?and?trace?element?groups?(b)?of?Niutitang?shale?at?well?ZX??

體環(huán)境??下,海水中鱗有充足的M〇元素,相應(yīng)的進(jìn)人沉積物??中的Mo/TOC隹也較高在烏限封閉的環(huán)境中,M.q??元素的補(bǔ)紿緩慢甚至停止造成底層水中Mo濃度??的降低,尤其在缺氧還原條件下,Mo元素被沉積物??吸:收富_的速.率大于補(bǔ)_遽率,_應(yīng)歸傘中的低??2?400??::裏....



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