| 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80－160 mw/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。 |
| 关键词: 冲绳海槽 热流场 数值模拟 形成机制 样条函数 |
| DOI： |
| 分类号: |
| 基金项目: |
附件 |
|
| STUDY ON THE OKINAWA TROUGH'S HEAT FLOW MECHANISM USING SPLINE FUNCTION CALCULATION |
|
Jiang Xiaodian, Wang Shuoru
|
|
Deparment of Geology, Ocean University of Qingdao, Qingdao 266003
|
| Abstract: |
| Calculation on digitally filtered 1984 - 1990 measured heat flow data showed that the Okinawa Trough’s regional geothermal flow from the deep crust ranged from 80 milliwatt per square meter to 160 milliwatt per square meter. The mechanism of the submarine high heat flow values is discussed based on its temperature field model obtained by B-spline function numerical simulation which showed that the regional variation of the geothermal flow in the grough was positively correlated to the deep-seated structural framework, and that the high heat flow values resulted from the current tectonic activity characterized by thinning of the crust and uplifting of the mantle.
Geothermal field calculation showed that the average depth of the Curie isotherm under the trough was 12 km, minimum of 8 km in the southern part and maximum in the northern part. The existence of local anomaly on the original high background of the geothermal field indicates that the Okinawa Trough is a new marginal basin whose southern part is relatively well-developed. |
| Key words: Okinawa, Trough, Heat flow field, Numerical simulation, Mechanism, Spline function |
