HEAT FLOW AND SURFACE RADIOACTIVITY AT TWO SITES IN SOUTH GREENLAND.
HEAT FLOW AND SURFACE RADIOACTIVITY AT TWO SITES IN SOUTH GREENLAND.
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格陵兰岛南部两个地点的热流和表面放射性。
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
R. Munroe
中科院分区：
文献类型：
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作者：
J. Sass;B. Nielsen;H. Wollenberg;R. Munroe
在格陵兰岛南部前寒武纪地盾的两个地点测定了热流和地表放射性。Ketilidian （~ 1700-1500 m.y）片麻岩中两个洞的ivig热流q平均为1.0±0.1 HFU (μcal cm - 2 sec - 1)，放射源产热A0平均为5.5±1.5 HGU（10−13 cal cm - 3 sec - 1）。这些数据与加拿大和澳大利亚盾的其他对q和A0值一致。然而，在Ilimaussaq碱侵入的西北边缘附近的4个孔中，garar （~ 1000 m.y）年龄的q平均值仅为0.9±0.1 HFU，而A0平均值为bbb20 HGU。这一观测结果表明，除非格陵兰岛这一地区来自地幔的热流出乎意料地低，否则侵入的高放射性部分相当薄（约1公里），下面的地壳岩石含有很少的放射性。
Heat flow and surface radioactivity were determined at two sites in the Precambrian shield of south Greenland. At Ivigtut heat flow q from two holes in Ketilidian (∼1700–1500 m.y.) gneisses averaged 1.0 ± 0.1 HFU (μcal cm−2 sec−1), and the radiogenic heat production A0 averaged 5.5 ± 1.5 HGU (10−13 cal cm−3 sec−1). These data are consistent with other pairs of q and A0 values from the Canadian and Australian shields. In four holes near the northwestern edge of the Ilimaussaq alkali intrusion of Gardar (∼1000 m.y.) age, however, q averages only 0.9 ± 0.1 HFU, whereas A0 averages >20 HGU. This observation implies that, unless heat flow from the mantle is unexpectedly low in this part of Greenland, the highly radioactive part of the intrusion is quite thin (∼1 km) and the underlying crustal rocks contain very little radioactivity.