Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/NGEO2849 |
Decrease in oceanic crustal thickness since the breakup of Pangaea | |
Van Avendonk, Harm J. A.; Davis, Joshua K.; Harding, Jennifer L.; Lawver, Lawrence A. | |
2017 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:1 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Earth's mantle has cooled by 6-11 degrees C every 100 million years since the Archaean, 2.5 billion years ago. In more recent times, the surface heat loss that led to this temperature drop may have been enhanced by plate-tectonic processes, such as continental breakup, the continuous creation of oceanic lithosphere at mid-ocean ridges and subduction at deep-sea trenches. Here we use a compilation of marine seismic refraction data from ocean basins globally to analyse changes in the thickness of oceanic crust over time. We find that oceanic crust formed in the mid-Jurassic, about 170 million years ago, is 1.7 km thicker on average than crust produced along the present-day mid-ocean ridge system. If a higher mantle temperature is the cause of thicker Jurassic ocean crust, the upper mantle may have cooled by 15-20 degrees C per 100 million years over this time period. The difference between this and the long-term mantle cooling rate indeed suggests that modern plate tectonics coincide with greater mantle heat loss. We also find that the increase of ocean crustal thickness with plate age is stronger in the Indian and Atlantic oceans compared with the Pacific Ocean. This observation supports the idea that upper mantle temperature in the Jurassic was higher in the wake of the fragmented supercontinent Pangaea due to the effect of continental insulation. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000394117300015 |
WOS关键词 | EAST PACIFIC RISE ; MID-ATLANTIC RIDGE ; SEISMIC-REFRACTION DATA ; WESTERN NORTH-ATLANTIC ; CALIFORNIA CONTINENTAL-MARGIN ; CASCADIA SUBDUCTION ZONE ; ONTONG JAVA PLATEAU ; VEMA FRACTURE-ZONE ; WIDE-ANGLE ; BOTTOM SEISMOMETER |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34875 |
专题 | 地球科学 气候变化 |
作者单位 | Univ Texas Austin, Inst Geophys, Jackson Sch Geosci, Austin, TX 78758 USA |
推荐引用方式 GB/T 7714 | Van Avendonk, Harm J. A.,Davis, Joshua K.,Harding, Jennifer L.,et al. Decrease in oceanic crustal thickness since the breakup of Pangaea[J]. NATURE GEOSCIENCE,2017,10(1). |
APA | Van Avendonk, Harm J. A.,Davis, Joshua K.,Harding, Jennifer L.,&Lawver, Lawrence A..(2017).Decrease in oceanic crustal thickness since the breakup of Pangaea.NATURE GEOSCIENCE,10(1). |
MLA | Van Avendonk, Harm J. A.,et al."Decrease in oceanic crustal thickness since the breakup of Pangaea".NATURE GEOSCIENCE 10.1(2017). |
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