用样条函数计算结果研究冲绳海槽热源机制  

STUDY ON THE OKINAWA TROUGH'S HEAT FLOW MECHANISM USING SPLINE FUNCTION CALCULATION

作　　者：姜效典[1] 王硕儒[1] 

机构地区：[1]青岛海洋大学地质系,青岛266003

出　　处：《海洋与湖沼》1996年第4期394-399,共6页Oceanologia Et Limnologia Sinica

摘　　要：对冲绳海槽1984－1990年的实测热流值，利用数字滤波方法计算，得到反映该区深部地壳热状态的区域热流值为80－160mw/m2；用B样条函数法对其作数值模拟，计算出海槽地温场模式，并以此研究冲绳海槽海底高热流的形成机制，得出冲绳海槽热流值的区域性变化与其深部地质构造格局呈正相关，高热流是该区现代构造活动所致，其明显特征是地壳减薄、地幔上拱等结论。Calculation on digitally filtered 1984-1990 measured heat flow datashowed that the Okinawa Trough's regional geothermal flow from the deep crustranged from 80 milliwatt per square meter to 160 milliwatt per square meter. Themechanism of the submarine high heat flow values is discussed based on itstemperature field model obtained by B-spline funtion numrical simulation whichshowed that the regional variation of the geothermal flow in the grough was positive-ly correlated to the deep-seated structural framework, and that the high heat flowvalues resulted from the current tectonic activity characterized by thinning of thecrust and uplifting of the mantle.Geothermal field calculation showed that the average depth of the Curie isothermunder the trough was 12km, minimum of 8km in the southern part and maximumin the northern part. The existenee of local anomaly on the original high backgroundof the geothermal field indicates that the Okinawa Trough is a new marginal basinwhose southern part is relatively well-developed.

关 键 词：冲绳海槽 热流场 热源机制 样条函数 海底热流 

分 类 号：P738.6[天文地球—海洋地质]