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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Subduction control on the curie isotherm around the Pacific-North America plate boundary in northwestern Mexico (Gulf of California). Preliminary results
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Subduction control on the curie isotherm around the Pacific-North America plate boundary in northwestern Mexico (Gulf of California). Preliminary results

机译：对墨西哥西北部（加利福尼亚湾）太平洋-北美板块边界附近居里等温线的俯冲控制。初步结果

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摘要

Spectral analysis of NAMAG magnetic data enabled us to estimate depths to the Curie isotherm along the Pacific-North America plate boundary. The estimated depths for the Gulf of California, and southern Baja California peninsula, correlate quite well with the depths to the Moho available from previous studies based on receiver function, and seismic refraction. In northernmost Baja California, and southwestern USA no correlation is observed between depths to the Curie isotherm and depths to the mantle obtained from receiver function analysis. Depths to the Curie isotherm are shallower. Along the coastal plains of Sonora and Sinaloa, differences between receiver function based Mantle depths and Curie depths are equally large. However, there is more consistency with depths established by seismic refraction studies. Four zones with shallow Curie isotherm are identified in southern Gulf of California (GS1, GS2, GS3, and GS4). GS1 is located at the Gulf of California mouth. The Alarcon rise is located between GS1 and GS2. Pescaderos Basin is located northwest of GS2. GS3 stretches from the Carmen Basin to the Farallon Basin. GS4 extends from Tiburon Island up to northern Guaymas Basin. Northernmost shallow Curie depth zone (GN1) comprises Upper and Lower Delfin Basins, as well as the Consag and Wagner Basins. A northern prolongation also covers Pinacate Volcanic center. The southern shallow Curie isotherm zones are associated with lithospheric-asthenospheric material upwelling zones. GN1 also includes a convective component related to the younger magmatism of the Pinacate Volcanic Field.Deeper Curie depths are found at southern Baja California peninsula, interpreted as associated with thicker continental or stretched crust. It is possible that the crust is underlain or underplated by magnetic oceanic crust as suggested by satellite magnetic anomalies centered at the Magdalena shelf. A contrasting pattern features northern Baja California: deep Curie zones to the west contrasting with relative shallower Curie isotherm areas to the east. The prolongation towards the peninsula of the extinct Shirley transform fracture zone roughly separates the two domains observed along the peninsula, and suggests that the Curie isotherm along the peninsula is controlled by differences subduction of the Guadalupe and Magdalena microplates. Major differences pointed out between northern and southern Gulf of California might indicate that subduction also played a key role at the beginning of the opening of the Gulf of California, however, currently, the Curie pattern is controlled by the rifting processes (shallow Curie zones correlating quite well with the rift basins and the lithosphere-asthenosphere up welling material). (C) 2019 The Authors. Published by Elsevier B.V.
机译：NAMAG磁数据的频谱分析使我们能够估计沿太平洋-北美板块边界居里等温线的深度。加利福尼亚湾和南下加利福尼亚半岛的估计深度与基于接收器功能和地震折射的先前研究可得的莫霍面深度非常相关。在下加利福尼亚州的最北端和美国西南部，居里等温线的深度与从接收器功能分析获得的地幔深度之间没有相关性。居里等温线的深度较浅。沿索诺拉（Sonora）和锡那罗亚（Sinaloa）的沿海平原，基于接收器函数的地幔深度和居里深度之间的差异同样大。但是，通过地震折射研究确定的深度具有更大的一致性。在加利福尼亚湾南部（GS1，GS2，GS3和GS4）确定了四个具有居里等温线的区域。 GS1位于加利福尼亚湾口。阿拉尔孔上升段位于GS1和GS2之间。佩斯卡德罗斯盆地位于GS2的西北部。 GS3从卡门盆地一直延伸到法拉隆盆地。 GS4从Tiburon岛一直延伸到Guaymas盆地北部。最北端的浅居里深度带（GN1）包括上，下Delfin盆地，以及Consag和Wagner盆地。北部延长线也覆盖了皮纳卡特火山中心。南部居里等温浅层带与岩石圈-软流圈物质上升区相关。 GN1还包括与Pinacate火山场的年轻岩浆作用有关的对流成分。在南下加利福尼亚半岛发现了更深的居里深度，这被解释为与较厚的大陆或伸展的地壳有关。地壳可能位于磁性洋壳的下面或之下，这是由位于马格达莱纳架中心的卫星磁异常所暗示的。北下加利福尼亚州形成鲜明对比的特征是：西部居里区域较深，而东部居里等温线区域相对较浅。灭绝的Shirley转换断裂带向半岛的延伸大致分隔了沿半岛观察到的两个区域，并表明沿半岛的居里等温线受瓜达卢佩和马格达莱纳微孔板的差异俯冲控制。指出加利福尼亚北部和南部海湾之间的主要差异可能表明俯冲作用在加利福尼亚海湾开放之初也起了关键作用，但是，目前居里模式受裂谷过程控制（浅居里区与裂谷盆地和岩石圈-软流圈上升的井物质很好）。 （C）2019作者。由Elsevier B.V.发布

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