Faunal and facies changes through the mid Homerian (late Wenlock, Silurian) positive carbon isotope excursion in Podolia, western Ukraine
Faunal and facies changes through the mid Homerian (late Wenlock, Silurian) positive carbon isotope excursion in Podolia, western Ukraine
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乌克兰西部波多利亚荷马中期（文洛克晚期、志留纪）正碳同位素偏移期间动物区系和相的变化
作者：
Jarochowska;Munnecke;Frisch;Castagner
温洛克晚期具有两个全球性海退-海侵海平面变化旋回，并伴随着碳同位素双峰正偏移。的偏移的开始与灭绝事件影响笔石（thelundergievent），并提出影响牙形刺（穆尔德事件）和非骨骼碳酸盐的增殖相一致。为了验证海平面变化与生态变化之间的假设关系，本文从牙形石、层序和δ 13 C地层学的角度对Podolia地区的热带碳酸盐Homerian演替进行了研究。已识别出四个沉积层序。δ 13 C漂移的开始发生在DS 1和DS 2之间的边界处，对应于建议的冰川海平面变化起源的强制回归。与δ 13 C最高值（5.2‰）相关的随后的快速海平面海侵包括在Podolia记录为正常海退的高级变浅事件和DS 2与DS 3之间的边界。这段时间的特点是存在瘤样细胞和血栓形成。最新的温洛克海平面下降和相应的δ 13 C偏移的第二个峰值对应于Podolia的地层空区。第一个δ 13 C峰（DS 1和DS 2的顶部）对应于O. bohemica longaconodont带，两个峰之间的间隔（DS 3）对应于K. ortus absidata和C. murchisonizones，DS 4暂定为最低的卢德洛系列。波多利亚相对海平面变化的记录与英国和瑞典基于继承的重建是一致的。牙形石分类丰富度的适度下降可能反映了对它们灭绝的主要沉积控制。
The late Wenlock is characterized by two global regressive-transgressive eustatic cycles in association with a double-peaked positive carbon isotope excursion. The onset of the excursion coincides with an extinction event affecting graptolites (thelundgrenievent) and proposed to affect conodonts (the Mulde Event) and proliferation of non-skeletal carbonates. In order to test the hypothesized relationships between eustatic and ecological changes, the tropical carbonate Homerian succession in Podolia has been examined with respect to conodont, sequence andδ13C stratigraphy. Four depositional sequences (DS) have been identified. The onset of theδ13C excursion occurs at the boundary between DS1 and DS2, corresponding to a forced regression of proposed glacioeustatic origin. The following rapid eustatic transgression associated with the highestδ13C values of 5.2‰ includes a higher-order shallowing episode recorded in Podolia as normal regression and a boundary between DS2 and DS3. This interval is distinguished by the presence of oncoids and thrombolitic buildups. The latest Wenlock eustatic fall and the corresponding second peak of theδ13C excursion corresponds in Podolia to a stratigraphic gap. The firstδ13C peak (top of DS1 and DS2) corresponds to theO. bohemica longaconodont Zone, the interval between the two peaks (DS3) – toK. ortus absidataandC. murchisonizones, and DS4 is tentatively placed in the lowermost Ludlow Series. The record of relative sea-level changes in Podolia is consistent with reconstructions based on successions in England and Sweden. The moderate drop in conodont taxonomic richness may reflect the primary depositional control over their proposed extinction.
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影响因子：
1
作者：
Jarochowska E;Munnecke A. ;Koztowski W.
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影响因子：
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影响因子：
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DOI：
--
发表时间：
2009
期刊：
影响因子：
--
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DOI：
--
发表时间：
2006
期刊：
影响因子：
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作者：
L. Jeppsson;M. Eriksson;M. Calner
通讯作者：
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