本文關(guān)鍵詞： “PETM”事件 環(huán)境波動 陸相斷陷湖泊 古近紀(jì)早期 濟(jì)陽坳陷 石油地質(zhì).　出處：《地球科學(xué)》2016年11期 　論文類型：期刊論文

【摘要】：古近紀(jì)早期,地球上發(fā)生了古新世-始新世極熱氣候(PETM)事件,嚴(yán)重影響全球碳循環(huán)過程和海陸生態(tài)環(huán)境系統(tǒng).依據(jù)普通薄片、元素分析、碳同位素、TOC等實(shí)驗(yàn)結(jié)果.研究了渤海灣盆地濟(jì)陽斷陷湖盆古新世-始新世時(shí)期的湖泊環(huán)境時(shí)空波動變化及其對PETM事件的響應(yīng),發(fā)現(xiàn)濟(jì)陽斷陷湖盆早期經(jīng)歷了多旋回的演化過程,湖盆中碎屑物質(zhì)和化學(xué)物質(zhì)的分異作用同時(shí)發(fā)生,陸地風(fēng)化作用和化學(xué)沉積物質(zhì)分異指示了極熱氣候的變化過程;該時(shí)期湖水為逐漸咸化的鹽湖環(huán)境,具有空間的分帶性和時(shí)間的階段演化性,湖水咸化是熱氣候事件發(fā)生的直接響應(yīng);湖泊的時(shí)空波動演化經(jīng)歷了古新世-始新世時(shí)期的極熱氣候(PETM)事件,該事件早期湖泊尚未完全咸化,浮游生物比較繁盛,早期浮游植物對12 CO2的吸收,會導(dǎo)致短暫的湖泊古生產(chǎn)力較高,但是隨著湖盆逐漸咸化,生物的活動存活較難,主要以旱生植物為主,古生產(chǎn)力降到最低.由于過量的12 C吸收沉淀,造成湖泊沉積記錄中的δ13 C明顯負(fù)偏,最大可達(dá)5×10-3.由此證實(shí)全球PETM事件影響了古新世-始新世之交濟(jì)陽斷陷湖盆的時(shí)空演化和物質(zhì)分異過程.
[Abstract]:In the early Paleogene, PETM events occurred on the earth, which seriously affected the global carbon cycle process and marine and terrestrial ecological environment systems. The temporal and spatial fluctuation of lake environment during Paleocene to Eocene in Jiyang fault depression of Bohai Bay basin and its response to PETM events were studied. It is found that the early stage of Jiyang faulted lacustrine basin experienced a multi-cycle evolution process, and the differentiation of clastic material and chemical substance occurred simultaneously in the lake basin. Land weathering and chemical sediment differentiation indicate the process of extreme thermal climate change. In this period, the lake water is a salt lake environment, with spatial zonation and temporal evolution. The salinization of lake water is the direct response of the thermal climate event. The temporal and spatial fluctuation of lakes experienced the PETM event in Paleocene and Eocene. The lake was not completely salinized and plankton was abundant in the early stage of the event. The absorption of 12 CO2 by early phytoplankton led to higher paleoproductivity of the lake, but with the lake basin gradually brackish, the activity of organisms was difficult to survive, mainly xerophytes. The paleoproductivity is reduced to the lowest. The 未 13 C in the lake sediment record is obviously negative because of the excessive absorption and precipitation of 12C. The maximum is 5 脳 10 ~ (-3). It is confirmed that the global PETM event affected the spatiotemporal evolution and material differentiation of the Jiyang fault basin in Paleocene and Eocene.
【作者單位】： 復(fù)雜油氣田勘探開發(fā)重慶市重點(diǎn)實(shí)驗(yàn)室;中國地質(zhì)大學(xué)生物地質(zhì)與環(huán)境地質(zhì)國家重點(diǎn)實(shí)驗(yàn)室;重慶科技學(xué)院石油與天然氣工程學(xué)院;中國石化勝利油田分公司地質(zhì)科學(xué)研究院;
【基金】：國家自然科學(xué)基金項(xiàng)目(No.41202043) 生物地質(zhì)與環(huán)境地質(zhì)國家重點(diǎn)實(shí)驗(yàn)室開放基金項(xiàng)目(No.GBL21506) 中國石油科技創(chuàng)新基金項(xiàng)目(No.2014D-5006-0108) 重慶市教委科學(xué)技術(shù)研究項(xiàng)目(No.KJ1401316)
【分類號】：P534.61;P532
【正文快照】： 全球晚古新世-早始新世記錄著一系列短暫的熱事件,其中,發(fā)生在古新世-始新世之交的“PETM”事件為該時(shí)期的極熱氣候事件(Zachos,2001;Cramer et al.,2009;Morón et al.,2013).盡管溫度重建存在一定程度的不確定性,但古近紀(jì)早期全球溫暖氣候具有一致認(rèn)識(Arkaah et al.,2006).

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