The Orcadian Basin of northern Scotland (largely of Middle Devonian age) is a major lacustrine rift basin, with the widely correlateable, Achanarras/Sandwick lake bed extending for at least 800 km along the rift. Above this lake bed, there are about 540 m of cyclic lacustrine sediments, with lake sedimentation terminated by alluvial fan progadation. The Upper Stromness Flagstone Formation and the Rousay Flagstone Formation making up this lacustrine sequence are given revised and precise definitions within four reference sections from the Orkney Islands. The sequence consists of about 45 first-order cycles averaging about 12m in thickness, which resulted from long-term climatic fluctuations in rainfall with a cycle time-scale of about 25 000 years. Longer climatic fluctuations of about 100000 and 400000 years are also present. These periods correspond to the precession and two eccentricity orbital cycles. Detailed knowledge of the stratigraphy constrains the structural and maturation history of the basin. The basin formed in a series of extensional half graben, and the Orkney area suffered later inversion. The lake sediments first reached the oil window at relatively shallow depths (c. 2000m), probably in the early Carboniferous, implying very high geothermal gradients during the early part of the basin history as corroborated by the presence of Devonian volcanics in the region. In the Orkney area, uplift probably started in the late Carboniferous.
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Chinese Acad Sci, Inst Geol & Geophys, Gansu Province Key Lab Petr Resources Res, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
Univ Chinese Acad Sci, Beijing, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, Gansu Province Key Lab Petr Resources Res, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
Yang, Shuang
Chen, Guojun
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Chinese Acad Sci, Inst Geol & Geophys, Gansu Province Key Lab Petr Resources Res, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, Gansu Province Key Lab Petr Resources Res, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
Chen, Guojun
Lv, Chengfu
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Chinese Acad Sci, Inst Geol & Geophys, Gansu Province Key Lab Petr Resources Res, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, Gansu Province Key Lab Petr Resources Res, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
Lv, Chengfu
Li, Chao
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Chinese Acad Sci, Inst Geol & Geophys, Gansu Province Key Lab Petr Resources Res, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, Gansu Province Key Lab Petr Resources Res, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
Li, Chao
Yin, Na
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Chinese Acad Sci, Inst Geol & Geophys, Gansu Province Key Lab Petr Resources Res, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
Univ Chinese Acad Sci, Beijing, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, Gansu Province Key Lab Petr Resources Res, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
Yin, Na
Yang, Fei
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Chinese Acad Sci, Inst Geol & Geophys, Gansu Province Key Lab Petr Resources Res, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
Univ Chinese Acad Sci, Beijing, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, Gansu Province Key Lab Petr Resources Res, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
Yang, Fei
Xue, Lianhua
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Chinese Acad Sci, Inst Geol & Geophys, Gansu Province Key Lab Petr Resources Res, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R ChinaChinese Acad Sci, Inst Geol & Geophys, Gansu Province Key Lab Petr Resources Res, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
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Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R ChinaMacau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R China
Meng, Xu
Xu, Yi
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Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R ChinaMacau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R China
Xu, Yi
Xiao, Long
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Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R China
China Univ Geosci, Sch Earth Sci, Planetary Sci Inst, State Key Lab Geol Proc & Mineral Resources, Wuhan, Peoples R ChinaMacau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R China
Xiao, Long
Dang, Yanan
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Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R ChinaMacau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R China
Dang, Yanan
Zhu, Peimin
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China Univ Geosci, Sch Earth Sci, Planetary Sci Inst, State Key Lab Geol Proc & Mineral Resources, Wuhan, Peoples R ChinaMacau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R China
Zhu, Peimin
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Tang, Chi Pui
Zhang, Xiaoping
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Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R ChinaMacau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R China
Zhang, Xiaoping
Liu, Bing
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Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing, Peoples R ChinaMacau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R China
Liu, Bing
Gou, Sheng
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Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing, Peoples R ChinaMacau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R China
Gou, Sheng
Yue, Zongyu
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Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing, Peoples R ChinaMacau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R China