The Scotian Basin offshore Nova Scotia: thermal history and provenance of sandstones from apatite fission track and 40Ar/39Ar data
The Scotian Basin offshore Nova Scotia: thermal history and provenance of sandstones from apatite fission track and 40Ar/39Ar data
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新斯科舍省近海斯科舍盆地：来自磷灰石裂变径迹和 40Ar/39Ar 数据的砂岩的热历史和来源
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
C. Beaumont
中科院分区：
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作者：
A. Grist;P. Reynolds;M. Zentilli;C. Beaumont
本文介绍了Scotian盆地9口威尔斯井2-5 km深砂岩岩芯矿物的磷灰石裂变径迹和40 Ar/39 Ar年龄谱数据，并根据盆地的热历史和沉积物的物源进行了解释。研究的重点是将这些温度计的数据相互比较，并与以前发表的相同或附近威尔斯井的生物标志化合物的镜质体反射率和芳构化-异构化（A-I）反应进行比较。磷灰石裂变径迹年龄通常与预期一致，因为它们在~4 km深度（校正井底温度~120 °C）趋于零。 较浅（较低的温度）的样品部分退火，部分退火的程度与A-I反应的程度密切相关。两个热指示器在60-120 °C的温度范围内被激活。来自两个威尔斯井（Mic Mac J-77和伊利D-26）的样品是异常的。它们比目前的形式更退火。
Apatite fission track and 40Ar/39Ar age spectrum data from sandstone drill-core minerals taken from depths of 2–5 km in nine wells from the Scotian Basin are presented and interpreted in terms of the thermal history of the basin and the provenance of its sediments. The focus of the study is a comparison of the data from these thermochronometers with each other and with previously published vitrinite reflectance and aromatization–isomerization (A–I) reactions in biomarker compounds from the same or nearby wells.Apatite fission track ages are generally in agreement with expectations in that they trend to zero at a depth of ~4 km (corrected bottom-hole temperature ~120 °C). Shallower (lower present temperature) samples are partially annealed; the degree of partial annealing correlates closely with the degree of A–I reactions. Both thermal indicators are activated over the temperature range 60–120 °C.Samples from two wells, Mic Mac J-77 and Erie D-26, are anomalous. They are more annealed than present formati...