發(fā)布時(shí)間：2018-01-14 13:23

  本文關(guān)鍵詞：南海西北部表層沉積物黏土礦物分布特征及其來(lái)源　出處：《海洋學(xué)報(bào)》2017年09期 　論文類型：期刊論文

  更多相關(guān)文章： 黏土礦物組成 結(jié)晶學(xué)特征 物源分析 表層沉積物 南海西北部

【摘要】：黏土礦物研究在示蹤物源、源區(qū)風(fēng)化歷史乃至洋流變遷能力等方面具有重要的作用,盡管目前對(duì)南海表層沉積物黏土礦物宏觀分布特征已獲得了較系統(tǒng)的認(rèn)識(shí),但在受珠江和海南島物源共同影響的南海西北部其高分辨率的黏土礦物學(xué)工作還未開(kāi)展。本文對(duì)南海西北部表層沉積物中的黏土礦物組成、結(jié)晶學(xué)特征進(jìn)行了分析,討論了研究區(qū)黏土礦物的物質(zhì)來(lái)源。結(jié)果表明,南海西北部表層沉積物的黏土礦物組成以伊利石為主(平均45%),蒙脫石(平均27%)與高嶺石(平均21%)次之,綠泥石含量最少(平均6%)。在區(qū)域空間分布上,蒙脫石含量呈現(xiàn)西南高東北低的特征,伊利石含量則與之相反;高嶺石含量表現(xiàn)為近岸高離岸低,而綠泥石含量呈現(xiàn)離岸高近岸低的特征。總體上,研究區(qū)表層沉積物黏土礦物組成與現(xiàn)代珠江沉積物組成差異較大,而與珠江口2.5ka前的沉積物黏土礦物組成比較接近,并且結(jié)合研究區(qū)巖心揭露的全新世以來(lái)極低的沉積速率(4cm/ka)以及上部很薄(小于0.6m)的泥質(zhì)沉積,推測(cè)該區(qū)表層沉積物可能并非是現(xiàn)代沉積的結(jié)果,更可能主要來(lái)自全新世末期古珠江輸送的沉積物。除古珠江作為研究區(qū)表層沉積物中蒙脫石的一個(gè)主要來(lái)源外,海南島北部河流也貢獻(xiàn)了少量蒙脫石到其鄰近的東南海域。運(yùn)用高嶺石/伊利石比值和伊利石化學(xué)指數(shù)等進(jìn)一步對(duì)比分析表明,珠江是研究區(qū)沉積物中伊利石、高嶺石和綠泥石的主要物源,其次臺(tái)灣和海南島也可能分別提供了少量富含伊利石/綠泥石和高嶺石的沉積物。本工作對(duì)于南海西北部沉積物源-匯過(guò)程和相應(yīng)的古環(huán)境研究有重要的參考意義。
[Abstract]:The study of clay minerals plays an important role in tracer source, source area weathering history and ocean current transition ability, although the macroscopic distribution characteristics of clay minerals in surface sediments of the South China Sea have been systematically understood. However, the high-resolution clay mineralogy work has not been carried out in the northwestern South China Sea, which is influenced by both the Pearl River and Hainan Island provenances. This paper deals with the clay mineral composition in the surface sediments of the northwest South China Sea. The results show that the clay mineral composition of the surface sediments in the northwest South China Sea is mainly composed of Illite (average 45g). The content of montmorillonite (mean 27) and kaolinite (mean 21) was the second, and the content of chlorite was the least (mean 6%). In the regional spatial distribution, the content of montmorillonite showed the characteristics of high in southwest and low in northeast. The content of Illite is opposite to that of Illite. The content of kaolinite is high offshore and low offshore, while chlorite content is high and low offshore. Generally speaking, the clay mineral composition of surface sediments in the study area is quite different from that of modern Pearl River sediments. The composition of clay mineral in sediment is close to that of sediment before 2.5 ka in the Pearl River Estuary. And combined with the very low deposition rate of 4 cm / ka since Holocene exposed by cores in the study area and the very thin (less than 0.6 m) muddy deposits in the upper part of the study area. It is inferred that the surface sediments in this area may not be the result of modern sedimentation. It is more likely to come mainly from sediments transported from the late Holocene Paleo-Pearl River, except that the Paleo-Pearl River is a major source of montmorillonite in the surface sediments of the study area. The rivers in the northern part of Hainan Island also contributed a little montmorillonite to its adjacent southeast sea area. Further comparative analysis of kaolinite / Illite ratio and Illite chemical index shows that the Pearl River is the Illite in the sediments of the study area. The main source of kaolinite and chlorite. Secondly, Taiwan and Hainan Island may also provide a few sediments rich in Illite / chlorite and kaolinite, respectively. This work has important reference meaning for the study of sediment source-sink process and corresponding paleoenvironment in northwest South China Sea. Righteousness.
【作者單位】： 中國(guó)科學(xué)院海洋研究所海洋地質(zhì)與環(huán)境重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院大學(xué);巴黎第十一大學(xué)地球科學(xué)學(xué)院IDES實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(41622603,41576034)
【分類號(hào)】：P736.41
【正文快照】： 十一大學(xué)地球科學(xué)學(xué)院IDES實(shí)驗(yàn)室,法國(guó)巴黎奧賽91405)1引言南海西北部作為東亞大陸邊緣的一部分,與華南大陸接壤,緊鄰海南島、臺(tái)灣島以及呂宋島等島嶼,接受了大量來(lái)自陸地和島嶼風(fēng)化剝蝕的沉積物[1]。該區(qū)域作為亞洲大陸與南海深水區(qū)之間的過(guò)渡地帶和陸源物質(zhì)向海輸送的主要通

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