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Taranaki Basin : ウィキペディア英語版 | Taranaki Basin The Taranaki Basin is an onshore-offshore Cretaceous rift basin on the West Coast of New Zealand. Development of rifting was the result of extensional stresses during the breakup of Gondwanaland. The basin later underwent fore-arc and intra-arc basin development, due to the subduction of the Pacific Plate under the Australian Plate at the Hikurangi Subduction System.〔〔 The basin covers approximately 100,000 km2 of which the majority is offshore.〔〔 The basin contains mostly marine sediment, with significant terrestrial sediment from the Late Cretaceous to the Eocene. The majority of New Zealand's oil and gas production occurs within the basin, with over 400 wells and approximately 20 oil and gas fields being drilled.〔 ==Overview== The Taranaki Basin lies on the West coast of the North Island of New Zealand, and is approximately 400 km west of the current Pacific-Australian plate boundary.〔 It covers approximately 100,000 km2 and contains up to 9 km in sediment.〔 The basin is divided into two main components, the Western Platform and Eastern Mobile Belt, formerly known as the Taranaki Graben. The Western Platform is a relatively undeformed, stable block compared to the Eastern Mobile Belt. While it underwent block faulting throughout the Late Cretaceous to the Eocene, it has been stable since. This section of the basin contains between 2000 and 5000m of sediment, dating from the Late Cretaceous to present. The Western Platform is separated from the Eastern Mobile Belt on the East by the Cape Egmont fault zone, a northwest trending fault zone consisting of multiple subparallel reverse and normal faults.〔 The Eastern Mobile Belt consists of multiple grabens and contains multiple compressional features, including overthrusts, reverse faults, and inversion structures. The Eastern Mobile Belt extends from this fault zone to the north-south trending Taranaki fault zone, which is adjacent to the a large upthrust basement block that divides the Taranaki Basin from the later-formed, eastward Wanganui Basin.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Taranaki Basin」の詳細全文を読む
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