Systematic heat flow measurements across the Wagner Basin, northern Gulf of California
Systematic heat flow measurements across the Wagner Basin, northern Gulf of California
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DOI：
10.1016/j.epsl.2017.09.037
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发表时间：
2017-12-01
影响因子：
5.3
通讯作者：
Gonzalez-Fernandez, Antonio
中科院分区：
文献类型：
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作者：
Neumann, Florian;Negrete-Aranda, Raquel;Gonzalez-Fernandez, Antonio
裂谷作用的地球动力学的主要控制因素是热状态。为了更好地了解北方加州湾裂谷的地球动力学，我们系统地测量了瓦格纳盆地的热流，这是一个构造活动盆地，位于塞罗普列托断层南端附近。热流剖面长40公里，标称测量间距约为1公里，并与地震反射剖面放在一起。热流测量用6.5米的小提琴弓探头。虽然热流数据是在浅水中收集的，那里的底层水温有显着的时间变化，我们使用CTD多年来收集的数据来校正我们的测量，以产生准确的热流值。经底层水温校正后，盆地西部、中部和东部热流的平均值和标准差分别为220 +/- 60，99 +/- 14，889 +/- 419 mW m（-2）。对沉积作用的校正将使盆地中部测得的热流增加40%至60%。我们解释了相对较高的热流和大的变化在西部和东部的侧翼在海底以下的深度向上的流体流动，而较低的和更一致的值在整个盆地的中央部分的传导传热的暗示。此外，在中央盆地的热流是一致的辉长岩底侵在15公里的深度，并建议大陆断裂在这里还没有完成。(C)2017 Elsevier B. V.版权所有。
A primary control on the geodynamics of rifting is the thermal regime. To better understand the geodynamics of rifting in the northern Gulf of California we systematically measured heat-flow across the Wagner Basin, a tectonically active basin that lies near the southern terminus of the Cerro Prieto fault. The heat flow profile is 40 km long, has a nominal measurement spacing of similar to 1 km, and is collocated with a seismic reflection profile. Heat flow measurements were made with a 6.5-m violin-bow probe. Although heat flow data were collected in shallow water, where there are significant temporal variations in bottom water temperature, we use CTD data collected over many years to correct our measurements to yield accurate values of heat flow. After correction for bottom water temperature, the mean and standard deviation of heat flow across the western, central, and eastern parts of the basin are 220 +/- 60, 99 +/- 14, 889 +/- 419 mW m(-2), respectively. Corrections for sedimentation would increase measured heat flow across the central part of basin by 40 to 60%. We interpret the relatively high heat flow and large variability on the western and eastern flanks in terms of upward fluid flow at depth below the seafloor, whereas the lower and more consistent values across the central part of the basin are suggestive of conductive heat transfer. Moreover, heat flow across the central basin is consistent with gabbroic underplating at a depth of 15 km and suggests that continental rupture here has not gone to completion. (C) 2017 Elsevier B.V. All rights reserved.