Upper Proterozoic stratigraphy and depositional environments of the Tossåsfjället Group, Särv Nappe, southern Swedish Caledonides
Upper Proterozoic stratigraphy and depositional environments of the Tossåsfjället Group, Särv Nappe, southern Swedish Caledonides
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瑞典喀里多尼德南部 Särv Nappe 托索斯山群的上元古界地层和沉积环境
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发表时间：
1980
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通讯作者：
R. Kumpulainen
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作者：
R. Kumpulainen
摘要：在瑞典南部Caledonides的Sarv推覆体中发现了一个厚的上元古代沉积层序（4.5 ~ 6 km）。该层序被定义为Tossasfjallet群，可分为五个组，按升序命名为Lunndorrsfjallen组（冲积）、Krakhammaren组（冲积-滨水）、Storan组（滨水）、Lillfjallet组（冰川-冰缘-水生）和Lovan组（冲积）。贯穿整个群的古水流表明，沉积物从芬诺斯坎德地盾向西北方向移动。该群被拉斑岩岩脉群以高角度切割。加里东造山运动期间，萨夫推覆体向东-东南方向位移超过250公里。推覆体在其主要露头区雅姆特兰发育为一个主要的平卧褶皱；其下肢高度衰减，糜棱化，大部分被基底逆冲面切断。
Abstract A thick upper Proterozoic sedimentary sequence (4.5–6 km) has been identified in the Sarv Nappe of the southern Swedish Caledonides. The sequence, defined as the Tossasfjallet Group, is divisible into five formations named in ascending order as the Lunndorrsfjallen Formation (alluvial), Krakhammaren Formation (alluvial-littoral), Storan Formation (littoral), Lillfjallet Formation (glacial-periglacial-aquatic), and Lovan Formation (alluvial). Palaeocurrents throughout the whole of the group suggest a general sediment transport from the Fennoscandian Shield towards the northwest. The group is cut at high angles by a tholeiitic dyke swarm. During the Caledonian Orogeny the Sarv Nappe was displaced east-southeastwards over a distance exceeding 250 km. In its main outcrop area in Jamtland the nappe occurs as a major recumbent fold; its lower limb is highly attenuated, mylonitized and largely cut out by the basal thrust plane.