南海北部陆坡神狐海域富有孔虫沉积层的特征及成因
Characteristics and origin of the Foraminifera-rich sedimentary layers in Shenhu area on the northern continental slope of the South China Sea
查看参考文献29篇
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文摘
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浊流和碎屑流等粗粒沉积是深海油气和天然气水合物良好的储层,它的发现和识别对于深海油气和天然气水合物的勘探具有重要意义。在南海北部陆坡神狐海域水深1805 m海底采集的长5.5 m柱状沉积物由2层富有孔虫层和2层深灰色泥质粉砂层相间组成,其中深灰色泥质粉砂层(A_1和A_3)主要为黏土矿物、石英和长石组成,粒径中值在6~15 μm之间,Ti/Al、K/Al和Fe/Al比值类似于南海神狐海域表层半深海沉积特征,而富有孔虫砂层(A_2和A_4)的粒度具有向上递减的特征,形成由粗到细的正粒序构造,粒径中值高,Ti/Al、K/Al和Fe/Al比值较高,与A_1和A_3灰色泥质粉砂层相比,含有更多的粗粒陆源物,推测可能是浊流经底流改造的碎屑流沉积。浮游有孔虫~(14)C定年表明下部的A_4层可能晚于42.46~43.53 ka B P,A_2层晚于15.1~15.3 ka B P。浊流从浅海搬运来的大量有孔虫在陆坡经碎屑流改造形成富集CaCO_3的有孔虫富集层。 |
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其他语种文摘
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Deep-water turbidite and debris flow in submarine canyons can be reservoir favorable for marine gas hydrate and deep-water oil, so their discovery and identification could be significant for prospecting of marine gas hydrate and deep-sea oil. For sediments in gravity core DH-1 collected in Shenhu area on the northern continental slope of the South China Sea at water depth of 1805 m, they are composed of two Foraminifera-rich layers (A_2 and A_4) and two dark-gray clay silt layers (A_1 and A_3). Major element chemistry and grain size and minerals analysis suggest that these dark-gray clay silt layers represent background hemipelagic sediments. The intervening Foraminifera-rich layers (A_2 and A_4), which exhibit a large median grain size range, are debris flow and turbidite resulted from bottom current reconstruction. Their relatively high Ti/Al, K/Al and Fe/Al ratios and carbonate contents as well as higher median grain size imply a more coarse detrital materials input. Radiocarbon dating of hemipelagic sediments indicates that the age of the turbidity in A_2 and A_4 could be later than 42.46~43.53 ka BP and 15.1 ~15.3 ka BP, respectively. These data indicate that the abundant Foraminiferal brought by turbidite from shallow-water and bottom current was reconstructed, and causes the enrichment of CaCO_3 in Foraminifera-rich layers. |
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来源
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地球化学
,2015,44(6):564-570 【核心库】
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关键词
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南海北部
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有孔虫富集层
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浊流
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~(14)C定年
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地址
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中国科学院广州地球化学研究所, 中国科学院边缘海地质重点实验室, 广东, 广州, 510640
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0379-1726 |
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学科
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地质学 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:5571948
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