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Geochemical study of hydrothermal solution using chemical elements as tracer.

以化学元素为示踪剂的热液地球化学研究。

基本信息

批准号：
60470039
负责人：
OKABE Shiro
金额：
$ 3.71万
依托单位：
Faculty of Marine Science and Technology, Tokai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

项目摘要

Sea water and sediment samples were collected in 1984-1986 by R/V. "Tokai-Daigaku Maru" from the Mariana and the Okinawa Troughs,where hydrothermal eruption has been confirmed by "Alvin" and "Shinkai-2000". Nutrients,dissolved oxygen,methane,major elements and manganese in sea water, and several chemical components in the sediments were analysed. The ratios of Na,K,Mg and Ca versus salinity were uniform the surface to the bottom waters and showed a slight increase just above the bottoms. Manganese concenteation in seawater columns in the Mariana Trough ranged 0.71-2.48 nmo1/Kg,and was high in the surface and low in the lower layer and then increased again in the bottom. Concenteation of manganese in the Okinawa Trough waters on March'86 ranged 0.18-3.64 nmo1/Kg, showing sharp increases from the middle,about 700m,to the bottom,about 1500 m,layers. Anomalies of manganese concentration,about 5 nmo1/Kg,were observed just above the bottoms in the Okinawa Trough on November'86. These anomalies of manganese concentration may be related to the hydrothermal activity. Methane concentrations in the Okinawa Trough ranged 30-50nl/l and showed a slight increase above the bottoms. The sediments in these two Troughs were presumed to be of the hydrothermal characteristics from the triangle diagram of Fe-Mn-(Ni+Cu+co)x10. Average concentrations of total carbonate and phosphate in the pore waters of the sediments in the Okinawa Trough were 4.06 and 9.29 mM/l resp.,These values being higher than those in seawater just above the sediments.

1984-1986年由R/V收集海水和沉积物样品。来自马里亚纳海和冲绳海槽的“东海-大陆丸”，那里的热液喷发已被“阿尔文”和“新海-2000”证实。分析了海水中的营养物、溶解氧、甲烷、主要元素和锰，以及沉积物中的几种化学成分。Na、K、Mg和Ca与盐度的比值从表层到底部是均匀的，在底部以上略有增加。马里亚纳海槽海水柱中锰浓度为0.71 ~ 2.48 nmo1/Kg，表层高，下层低，底部再升高。1986年3月冲绳海槽水体锰浓度在0.18 ~ 3.64 nmo1/Kg之间，从中层（约700m）到底层（约1500 m）呈急剧上升趋势。1986年11月，在冲绳海槽底部上方观测到锰浓度异常，约为5 nmo1/Kg。这些锰浓度异常可能与热液活动有关。冲绳海槽甲烷浓度在30 ~ 50nl/l之间，底部以上略有上升。根据Fe-Mn-(Ni+Cu+co)x10三角图推测，两个槽内沉积物具有热液特征。冲绳海槽沉积物孔隙水中总碳酸盐和总磷酸盐的平均浓度分别为4.06和9.29 mM/l。这些值高于沉积物上方海水中的值。