西太平洋雅浦海沟区海底热流原位测量

为了解西太平洋雅浦海沟区俯冲带及岛弧两侧的海底热流分布情况,2015年1-3月期间的西太平洋海山航次中,"科学"号利用最新一代Lister型热流探针对该区域开展了海底热流原位测量工作。沿着横跨俯冲带的站位测线,本次进行了10个热流站位测量,共获得8个站位的有效数据。测量结果表明,该地区地温梯度的变化范围为0.011~0.137 Km-1,平均0.089 Km-1,热导率的变化范围为0.58~1.32 Wm-1K-1,热流值则在14.4~118.85 mWm-2之间,平均为68.02 mWm-2。热流值分布显示,雅浦岛弧附近具有较高的热流值,自雅浦岛弧向两侧热流值逐渐降低,低热流区主要分布在帕里西维拉海盆。由于该地区热流测量数据依然稀缺,深入的讨论有待进一步研究。

HEAT FLOW IN-SITU MEASUREMENT AT YAP TRENCH OF THE WESTERN PACIFIC

To investigate the geothermal distribution on the two sides of the subduction zone along the Yap trench-arc system in the Western Pacific, the latest Lister heat flow probe was employed for in-situ measurement of heat flow aboard the "kexue" research vessel during the Haishan cruises to this area from January to March, 2015. A total of ten heat flow points was measured across the subduction zone of Yap trench. However, only eight effective data were successfully obtained. The results show that the geothermal gradient of this area ranges from 0.011 Km-1 to 0.137 Km-1, with an average of 0.089 Km-1, the thermal conductivity ranges from 0.58 Wm-1K-1 to 1.32 Wm-1K-1, and value of heat flow ranges from 14.4 mWm-2 to 118.85 mWm-2, with an average of 68.02 mWm-2. The geothermal distribution indicates that values of heat flow in the area are really quite high. Low heat flow is found in the Parece Vela ocean basin. There is a distribution tendency that the heat flow gradually reduces from the axis of Yap arc to either side. Due to the heat flow data for the region is still scarce, more scientific problems will be further researched.