The Mesozoic Victoria Basin: Vanished link between Antarctica and Australia
The Mesozoic Victoria Basin: Vanished link between Antarctica and Australia
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DOI：
10.1130/g33409.1
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发表时间：
2013-10-01
期刊：
影响因子：
5.8
通讯作者：
Laeufer, Andreas L.
中科院分区：
文献类型：
--
作者：
Lisker, Frank;Laeufer, Andreas L.
横贯南极山脉（TAM）是世界上最大的非挤压型山脉带。其起源传统上与侏罗纪费拉尔岩浆活动期间的地壳增厚有关，随后在早白垩世和晚白垩世以及古新世以来发生了间歇性隆升。这种长期存在的地貌高地的概念几乎是所有冈瓦纳大陆重建和全球气候模型的基础。在此，我们证明热年代学（磷灰石裂变径迹）数据和地层信息之间的交叉年龄关系与这种既定的解释相矛盾。相反，这些数据以及大量独立的热指标和地质证据表明，至少在晚三叠世到晚白垩世期间，包括费拉尔岩浆活动期间，在冈瓦纳大陆内部存在一个巨大的盆地。在此将其称为中生代维多利亚盆地（MVB），该盆地是在南极洲和澳大利亚的古太平洋边缘地壳伸展过程中形成的。横贯南极山脉的隆升以及相关的盆地反转仅在古近纪随着西南极裂谷系的发育才开始。对长期存在的中生代维多利亚盆地的认识对全面理解冈瓦纳大陆的地貌、南极洲和澳大利亚之间的分裂、西南极裂谷作用和横贯南极山脉的隆升以及全球长期气候演变和动物群辐射具有重要意义。
The Transantarctic Mountains (TAM) are the largest non-compressional mountain belt in the world. Their origin is traditionally related to crustal thickening during the Jurassic Ferrar magmatic event that was followed by episodic uplift in the Early and Late Cretaceous and since the Paleocene. This concept of a long-lived morphological high constitutes a base of virtually all Gondwana reconstructions and global climate models. Here we demonstrate that crossover age relationships between thermochronological (apatite fission track) data and stratigraphic information contradict this established interpretation. Instead these data, together with a wealth of independent thermal indicators and geological evidence require the existence of a vast intra-Gondwana basin between at least Late Triassic and Late Cretaceous times, including during the Ferrar magmatic event. Referred to here as the Mesozoic Victoria Basin (MVB), this basin formed during crustal extension across the paleo-Pacific margin of Antarctica and Australia. Uplift of the TAM with associated basin inversion commenced only with the development of the West Antarctic Rift System in Paleogene times. The recognition of the long-lived MVB has primary consequences for the general understanding of the landscape of Gondwana and the breakup between Antarctica and Australia, West Antarctic rifting and uplift of the TAM, and global long-term climate evolution and faunal radiation.