{"title":"英国宾夕法尼亚州中部Millstone Grit群早期Marsdenian亚相的综合层序地层分析","authors":"M. Brettle, C. Waters, S. Davies","doi":"10.1144/pygs2021-014","DOIUrl":null,"url":null,"abstract":"The early Marsdenian substage (Millstone Grit Group) of the Pennines comprises repeated deltaic cycles separated by ammonoid-bearing marine bands. This cyclicity, controlled by the combined forces of glacio-eustasy and modulations in sediment supply, provides an important outcrop area for the application of sequence stratigraphic principles.\n \n A new correlation framework is presented where two orders of sequence are identified: – (1) a low-order sequence, within which marine bands (R\n 2a\n 1, R\n 2b\n 1, R\n 2b\n 2 and R\n 2b\n 3) represent a maximum flooding surface, and (2) high-order sequences nested within the low-order sequences. By integrating and correlating key exposures, historic well boreholes and field mapping, lateral changes in facies and facies association are observed, and palaeogeographic trends mapped. This allows the variation in sequence and systems tract stacking patterns to be interpreted. Three orders of Milankovitch cyclicity are inferred to control the sequence stacking patterns; long-duration (∼400ka) eccentricity oscillation controlling maximum flooding events represented by the R\n 2a\n 1 and R\n 2b\n 2 marine bands, sub-100ka obliquity oscillations (controlling the R\n 2b\n 1, R\n 2b\n 2 and R\n 2b\n 3 marine bands and intervening low-order sequence boundaries), and precessional frequencies (∼25ka) which may control the periodicity of the high-order sequences.\n \n \n Supplementary material:\n https://doi.org/10.6084/m9.figshare.c.6408203\n","PeriodicalId":49665,"journal":{"name":"Proceedings of the Yorkshire Geological Society","volume":"1 1","pages":""},"PeriodicalIF":0.5000,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"An integrated sequence stratigraphic analysis of the early Marsdenian substage of the Millstone Grit Group, Central Pennines, UK\",\"authors\":\"M. Brettle, C. Waters, S. Davies\",\"doi\":\"10.1144/pygs2021-014\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The early Marsdenian substage (Millstone Grit Group) of the Pennines comprises repeated deltaic cycles separated by ammonoid-bearing marine bands. This cyclicity, controlled by the combined forces of glacio-eustasy and modulations in sediment supply, provides an important outcrop area for the application of sequence stratigraphic principles.\\n \\n A new correlation framework is presented where two orders of sequence are identified: – (1) a low-order sequence, within which marine bands (R\\n 2a\\n 1, R\\n 2b\\n 1, R\\n 2b\\n 2 and R\\n 2b\\n 3) represent a maximum flooding surface, and (2) high-order sequences nested within the low-order sequences. By integrating and correlating key exposures, historic well boreholes and field mapping, lateral changes in facies and facies association are observed, and palaeogeographic trends mapped. This allows the variation in sequence and systems tract stacking patterns to be interpreted. Three orders of Milankovitch cyclicity are inferred to control the sequence stacking patterns; long-duration (∼400ka) eccentricity oscillation controlling maximum flooding events represented by the R\\n 2a\\n 1 and R\\n 2b\\n 2 marine bands, sub-100ka obliquity oscillations (controlling the R\\n 2b\\n 1, R\\n 2b\\n 2 and R\\n 2b\\n 3 marine bands and intervening low-order sequence boundaries), and precessional frequencies (∼25ka) which may control the periodicity of the high-order sequences.\\n \\n \\n Supplementary material:\\n https://doi.org/10.6084/m9.figshare.c.6408203\\n\",\"PeriodicalId\":49665,\"journal\":{\"name\":\"Proceedings of the Yorkshire Geological Society\",\"volume\":\"1 1\",\"pages\":\"\"},\"PeriodicalIF\":0.5000,\"publicationDate\":\"2023-02-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Proceedings of the Yorkshire Geological Society\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1144/pygs2021-014\",\"RegionNum\":4,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"GEOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the Yorkshire Geological Society","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1144/pygs2021-014","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOLOGY","Score":null,"Total":0}
An integrated sequence stratigraphic analysis of the early Marsdenian substage of the Millstone Grit Group, Central Pennines, UK
The early Marsdenian substage (Millstone Grit Group) of the Pennines comprises repeated deltaic cycles separated by ammonoid-bearing marine bands. This cyclicity, controlled by the combined forces of glacio-eustasy and modulations in sediment supply, provides an important outcrop area for the application of sequence stratigraphic principles.
A new correlation framework is presented where two orders of sequence are identified: – (1) a low-order sequence, within which marine bands (R
2a
1, R
2b
1, R
2b
2 and R
2b
3) represent a maximum flooding surface, and (2) high-order sequences nested within the low-order sequences. By integrating and correlating key exposures, historic well boreholes and field mapping, lateral changes in facies and facies association are observed, and palaeogeographic trends mapped. This allows the variation in sequence and systems tract stacking patterns to be interpreted. Three orders of Milankovitch cyclicity are inferred to control the sequence stacking patterns; long-duration (∼400ka) eccentricity oscillation controlling maximum flooding events represented by the R
2a
1 and R
2b
2 marine bands, sub-100ka obliquity oscillations (controlling the R
2b
1, R
2b
2 and R
2b
3 marine bands and intervening low-order sequence boundaries), and precessional frequencies (∼25ka) which may control the periodicity of the high-order sequences.
Supplementary material:
https://doi.org/10.6084/m9.figshare.c.6408203
期刊介绍:
The Proceedings of the Yorkshire Geological Society (PYGS) has been published without a break since 1839. It is one of the leading journals of British geology. Each year two parts are issued containing original research papers on all aspects of geology. Traditionally the Proceedings has given particular attention to the geology of northern England and its neighbouring areas. The submission of papers on related topics but of a more general interest is encouraged. All papers are subjected to the full scrutiny of two independent referees.