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General Levalle basin, Argentina: A frontier Lower Cretaceous rift basin

机译:阿根廷莱瓦勒将军盆地:前沿白垩纪裂陷盆地

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摘要

The General Levalle basin forms a long, narrow, and deep Early Cretaceous intracratonic rift in southern Córdoba province, Argentina. It trends approximately north-south for more than 150 km (93 mi), ranges from 5 to 50 km (3 to 31 mi) wide, and is more than 6500 m (21,325 ft) deep. Below a prominent middle Cretaceous unconformity, steeply dipping normal faults bound tilted graben and half-graben fault blocks. The lower rift-fill section, the General Levalle Formation (new formation name), is a Valanginian–Hauterivian siliciclastic and evaporite package more than 3200 m (10,500 ft) thick. It was deposited in an arid, restricted, rift basin that included a hydrologically closed saline lake. Nine lithology-based members represent one continuous cycle of deposition, with a lower coarse clastic sequence gradually fining upward into an evaporite member and then coarsening upward again to an upper sandstone. The uppermost rift-fill sequence, the Guardia Vieja Basalt (new formation name), is a series of Aptian basalt flows and sills more than 800 m (2625 ft) thick, with some thin red-bed intervals. Unstructured Upper Cretaceous to Pleistocene strata overlie the buried rift basin.
机译:勒瓦勒将军盆地在阿根廷科尔多瓦省南部形成一个长,窄而深的早白垩世克拉通裂谷( Argentina)。它趋向于大约南北超过 150 km(93 mi),范围从5到50 km(3到31 mi)宽, 超过6500 m (21,325英尺)深。在一个明显的中白垩统不整合面之下,陡峭倾斜的正常断层以 倾斜的grab陷和半断层断块为界。下部裂谷 部分,一般的莱瓦勒组(新的地层名称), 是瓦兰金—高特里夫硅质碎屑岩和蒸发岩 包裹,数量超过3200米(10,500英尺)厚。它沉积在一个干旱的,受限制的裂谷盆地中,该盆地包括一个水文封闭的盐湖。九个基于岩性的成员代表一个 连续的沉积循环,较低的粗碎屑 序列逐渐向上细化为蒸发岩成员,然后 然后向上粗化再次到上砂岩。最上面的 裂谷充填序列Guardia Vieja玄武岩(新形成的 名称)是一系列Aptian玄武岩流和基岩,其数量超过 800米(2625英尺)厚,间隔有一些薄红床。 非白垩纪至更新世地层覆盖在地下裂谷 盆地上。

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  • 来源
    《AAPG Bulletin》 |2004年第5期|00000627-00000652|共26页
  • 作者单位

    Hunt Oil Company, 1445 Ross at Field, Dallas, Texas, 75202bwebster@huntoil.com;

    Phoenix Oil & Gas S. A., Lavalle 710, 3°, Of. D, 1047 Buenos Aires, ArgentinaInstituto de Gas y del Petróleo, Facultad de Ingeniería (UBA), Las Heras 2214, 3°. 1127 Buenos Aires, Argentinachebli@datamarkets.com.ar;

    Fischer Petrologic, 16858 West 73rd Place, Arvada, Colorado, 80007fritzf@ix.netcom.com;

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