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Adelaide Rift Complex : ウィキペディア英語版
Adelaide Rift Complex
The Adelaide Rift Complex (also known as Adelaide Geosyncline) is a major geological province in central South Australia. It stretches from the northernmost parts of the Flinders Ranges, narrowing at the Fleurieu Peninsula and extending into Kangaroo Island, and composes the two major mountain ranges of the State: the Flinders Ranges and the Mount Lofty Ranges. The sediments in the rift complex were deposited between about 870 Ma (the middle Neoproterozoic) to ~500 Ma (the end of the Cambrian). They consist of a thick pile of sedimentary rocks and minor volcanic rocks that were deposited on the eastern margin of Australia during the time of breakup of the supercontinent Rodinia. A number of authors have noted the similarity in these sedimentary rocks with rocks found in western North America and have suggested that they were formerly adjacent to each other in Rodinia. This is one major correlation in the so-called SWEAT (SW USA against East Antarctica) reconstruction of Rodinia.
==Formation==

The Adelaide Rift Complex is a great belt of sediments, deposited in a depression during a time of lithospheric stretching in an arc approximately a thousand kilometres long and several hundred kilometres wide. The thickest parts of the belt are approximately 24,000 m thick. Limestones, shales, and sandstones indicate a predominantly marine environment.

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