沉積速率與基底蓄水層流體活動對沖繩海槽海底熱流值的影響
發(fā)布時(shí)間：2018-04-17 02:11
本文選題：地?zé)崽卣?/strong> + 沉積速率 ； 參考：《海洋地質(zhì)與第四紀(jì)地質(zhì)》2017年02期
【摘要】：沖繩海槽海底熱流值高且離散性強(qiáng)、熱液活動發(fā)育,這一地?zé)崽卣髦饕憩F(xiàn)在海槽南段與中段,其形成與沉積過程和淺層基底水熱活動密切相關(guān)。首先依據(jù)居里點(diǎn)深度資料計(jì)算海底熱流背景值,并與實(shí)測熱流資料進(jìn)行對比,分析了沖繩海槽的海底熱流異常特征。然后選取一條與海槽擴(kuò)張中心走向一致的模擬剖面,以實(shí)測地?zé)豳Y料為約束,利用熱模擬的方法,探討了沉積速率和基底流體活動對海底熱流值的影響。最后,探討了海槽熱流特征形成機(jī)制。熱模擬結(jié)果表明,如果南段與中、北段分別在中中新世和晚更新世開始拉張,在沖繩海槽的形成演化過程中,沉積速率可使海槽南段和中段的海底熱流值分別降低7%~16%和4%~12%,沉積速率越大對熱流值的影響也越大;在基底流體活動的影響下,海槽熱流值表現(xiàn)出極大的離散性,下降流體使得海底熱流值進(jìn)一步降低,上升流體作用則相反,海槽中段的上升流體影響遠(yuǎn)遠(yuǎn)超過沉積速率影響,使得局部海底熱流值提高到背景值的3倍。在局部上升流體與下降流體運(yùn)移速率相同的前提下,當(dāng)沉積速率25cm/ka、流體運(yùn)移速率為60~66cm/a時(shí)最符合海槽南段西部的熱異常形成條件;當(dāng)宮古斷裂及海槽中段基底蓄水層內(nèi)的流體運(yùn)移速率約為南段流體運(yùn)移速率的4~6倍,或者蓄水層之下熱流背景值約為南段背景值的2~3倍時(shí),最符合宮古斷裂帶附近和海槽中段的熱流異常形成條件,這可能預(yù)示著在10km深度處存在巖漿房。
[Abstract]:The Okinawa trough of the heat flow value is high and the strong discrete, hydrothermal activity and development, the geothermal features in the southern trough and middle, its formation is closely related to the deposition process and shallow basement hydrothermal activities. First according to the Curie point depth data to calculate the background value of the heat flow, and compared with the measured heat flux data and analysis of seafloor heat flow anomaly characteristics of the Okinawa trough. Then select a consistent with the trend of expansion trough simulation center section, based on the measured geothermal data as constraints, using the method of thermal simulation, discusses the influence of the deposition rate and basal fluid flow to the heat flow. Finally, discusses the characteristics of formation heat flow trough the mechanism of heat. The simulation results show that if the South and north respectively, opened in the middle Miocene and late Pleistocene, the formation and evolution of the Okinawa trough, the deposition rate to the south of the trough and middle segments The heat flow value decreased 7%~16% and 4%~12% respectively, the deposition rate increasing effect on heat value; in effect basal fluid activity, trough heat value showed great discreteness, decreased fluid makes the heat flow to further reduce the rise of fluid has the opposite effect, the effect of fluid trough middle rise far more than the deposition rate, the local heat value increased to 3 times the background value. In the local rise and fall of fluid fluid migration rate of the same premise, when the deposition rate of 25cm/ka, the rate of fluid migration is 60~66cm/a most accord with the southern trough in the abnormal heat forming condition; when 4~6 times the fluid migration rate of Miyako Island fault trough and middle basal aquifers in approximately south of fluid migration rate, or aquifer under heat background value is about 2~3 times of the background value, the most in line with the Miyako Island fault zone The conditions for the formation of heat flow anomalies in the middle section of the trough may indicate that there is a magma chamber at the depth of 10km.
【作者單位】： 中國地質(zhì)調(diào)查局青島海洋地質(zhì)研究所;青島海洋科學(xué)與技術(shù)國家實(shí)驗(yàn)室海洋礦產(chǎn)資源評價(jià)與探測技術(shù)功能實(shí)驗(yàn)室;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃“973”項(xiàng)目(2013CB429701)
【分類號】：P736;P744.4
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