Applications of detrital geochronology and thermochronology from glacial deposits to the Paleozoic and Mesozoic thermal history of the Ross Embayment, Antarctica
Applications of detrital geochronology and thermochronology from glacial deposits to the Paleozoic and Mesozoic thermal history of the Ross Embayment, Antarctica
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冰川沉积物碎屑地质年代学和热年代学在南极洲罗斯湾古生代和中生代热历史中的应用
DOI：
10.1002/2015gc005941
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
C. Kassab
中科院分区：
文献类型：
--
作者：
Bethany Welke;K. Licht;A. J. Hennessy;S. Hemming;Elizabeth Pierce Davis;C. Kassab
横贯南极山脉（TAM）的6个主要出入口冰川顶部的冰碛物和南极西部3条冰流下方的冰碛物中，普遍存在着跨越罗斯/泛非造山期（610-475 Ma）的锆石U - Pb年龄群。这些南极冰碛物碎屑矿物的年代学和热年代学揭示了TAM中部和南部两种不同的热历史。锆石双定年显示，在大多数样品中，地理分布广泛(U - Th)/He （ZHe）种群为180-130 Ma。沙克尔顿冰川的砂岩露头和来自三个冰碛的三个灯塔超群砂岩碎屑的年龄完全落在这个范围内。许多till样品与Beacon露头相似且接近，这使我们认为till中广泛的ZHe种群来自Beacon超群岩石，反映了Beacon盆地对Gondwana破裂的热响应。第二种老年人口（约200万）生活在伯德冰川、宁罗德冰川和芦苇冰川的顶端。对于Nimrod和Byrd冰川顶部的山丘，将双定年锆石结果与角闪石、白云母和黑云母的40Ar/39Ar，以及磷灰石的U - Pb和(U - Th - Sm)/He双定年结果相结合，得出花岗岩港侵入岩体侵位后590-475 Ma早期快速造山冷却（~ 4-10°C/Myr）的典型模式。这些地点的低温温度表得到的温度变化很大，但相当古老（480-70 Ma和200-70 Ma），需要在低温下经历很长时间。
Till from moraines at the heads of six major outlet glaciers in the Transantarctic Mountains (TAM) and from till beneath three West Antarctic ice streams have a ubiquitous zircon U‐Pb age population spanning the time of the Ross/Pan‐African Orogenies (610–475 Ma). Geochronology and thermochronology of detrital minerals in these Antarctic glacial tills reveal two different thermal histories for the central and southern TAM. Double‐dating of the zircons reveals a geographically widespread (U‐Th)/He (ZHe) population of 180–130 Ma in most of the till samples. Sandstone outcrops at Shackleton Glacier, and three Beacon Supergroup sandstone clasts from three moraines, have ZHe ages that fall entirely within this range. The similar population and proximity of many of the till samples to Beacon outcrops lead us to suggest that this extensive ZHe population in the tills is derived from Beacon Supergroup rocks and reflects the thermal response of the Beacon Basin to the breakup of Gondwana. A second population of older (>200 Ma) ZHe ages in tills at the head of Byrd, Nimrod, and Reedy Glaciers. For the tills at the head of the Nimrod and Byrd Glaciers, integrating the double‐dated zircon results with 40Ar/39Ar of hornblende, muscovite and biotite, and U‐Pb and (U‐Th‐Sm)/He double‐dates on apatite yields a typical pattern of early rapid orogenic cooling (∼4–10°C/Myr) 590–475 Ma after the emplacement of the Granite Harbour Intrusives. Low temperature thermochronometers at these sites yield variable but quite old ages (ZHe 480–70 Ma and AHe 200–70 Ma) that require a long history at low temperature.
艾森豪威尔山脉、横贯南极山脉：热年代学数据定性解释概念的评估
影响因子：
3.9
作者：
Prenzel;Lisker;Balestrieri;Läufer;Spiegel
通讯作者：
Spiegel
影响因子：
64.8
作者：
Naish, T.;Powell, R.;Williams, T.
通讯作者：
Williams, T.
基于热年代学、沉积岩成熟度和岩相限制的艾森豪威尔山脉、横贯南极山脉的埋藏和挖掘
影响因子：
2.9
作者：
Prenzel;Lisker;Elsner;Schöner;Balestrieri;Läufer;Berner;Spiegel
通讯作者：
Spiegel