V.V. Ene, S. Tapster, D.J. Smith, C. Panaiotu, E. Roşu, J. Naden, M. Munteanu
{"title":"延伸-旋转环境中岩浆活动和地壳继承的时空分布:南阿普塞尼山脉中新世和第四纪岩浆活动的最新地质年代学","authors":"V.V. Ene, S. Tapster, D.J. Smith, C. Panaiotu, E. Roşu, J. Naden, M. Munteanu","doi":"10.1144/jgs2023-048","DOIUrl":null,"url":null,"abstract":"Magmatism with arc-like features, formed in extensional settings, was active in the South Apuseni Mountains, Romania, during the Neogene and Quaternary periods. To date the chronological framework is primarily restricted to K-Ar dates. We present newly determined LA-ICP-MS U-Pb zircon age data for subvolcanic and volcanic rocks (N=20) from 8 different Cenozoic volcanic-intrusive complexes and from Jurassic and Cretaceous lava flows. Our results support magmatic ages between c. 14 to c. 7 Ma, with Uroi, an alkaline intrusion, occurring significantly later at c. 1.5 Ma. Revising the timeline for the South Apuseni Mountains paleomagnetic rotations shows that most of the vertical-axis clockwise rotation of the Apuseni Mountains (54.4° ± 10.7°) took place between approximately 14 and 11 Ma, the age interval when the majority of magmas were emplaced. Xenocrystic zircon dates exhibit differences in age populations between individual volcanic-intrusive complexes. A Permo-Triassic population is almost ubiquitous, indicating that basement Permo-Triassic igneous rocks are more widespread than previously thought or that they were significantly involved in the generation of Neogene magmas. However, other observed age populations, such as Triassic or Paleogene have no clear correspondence in the known geological record, indicating the presence of a cryptic component interacting with Neogene magmas.\n \n Supplementary material:\n https://doi.org/10.6084/m9.figshare.c.6951429\n","PeriodicalId":17320,"journal":{"name":"Journal of the Geological Society","volume":"6 1","pages":""},"PeriodicalIF":2.6000,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Spatio-temporal distribution of magmatism and crustal inheritance within an extensional-rotational environment: An updated geochronology of the Miocene & Quaternary magmatism of the South Apuseni Mountains\",\"authors\":\"V.V. Ene, S. Tapster, D.J. Smith, C. Panaiotu, E. Roşu, J. Naden, M. Munteanu\",\"doi\":\"10.1144/jgs2023-048\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Magmatism with arc-like features, formed in extensional settings, was active in the South Apuseni Mountains, Romania, during the Neogene and Quaternary periods. To date the chronological framework is primarily restricted to K-Ar dates. We present newly determined LA-ICP-MS U-Pb zircon age data for subvolcanic and volcanic rocks (N=20) from 8 different Cenozoic volcanic-intrusive complexes and from Jurassic and Cretaceous lava flows. Our results support magmatic ages between c. 14 to c. 7 Ma, with Uroi, an alkaline intrusion, occurring significantly later at c. 1.5 Ma. Revising the timeline for the South Apuseni Mountains paleomagnetic rotations shows that most of the vertical-axis clockwise rotation of the Apuseni Mountains (54.4° ± 10.7°) took place between approximately 14 and 11 Ma, the age interval when the majority of magmas were emplaced. Xenocrystic zircon dates exhibit differences in age populations between individual volcanic-intrusive complexes. A Permo-Triassic population is almost ubiquitous, indicating that basement Permo-Triassic igneous rocks are more widespread than previously thought or that they were significantly involved in the generation of Neogene magmas. 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Spatio-temporal distribution of magmatism and crustal inheritance within an extensional-rotational environment: An updated geochronology of the Miocene & Quaternary magmatism of the South Apuseni Mountains
Magmatism with arc-like features, formed in extensional settings, was active in the South Apuseni Mountains, Romania, during the Neogene and Quaternary periods. To date the chronological framework is primarily restricted to K-Ar dates. We present newly determined LA-ICP-MS U-Pb zircon age data for subvolcanic and volcanic rocks (N=20) from 8 different Cenozoic volcanic-intrusive complexes and from Jurassic and Cretaceous lava flows. Our results support magmatic ages between c. 14 to c. 7 Ma, with Uroi, an alkaline intrusion, occurring significantly later at c. 1.5 Ma. Revising the timeline for the South Apuseni Mountains paleomagnetic rotations shows that most of the vertical-axis clockwise rotation of the Apuseni Mountains (54.4° ± 10.7°) took place between approximately 14 and 11 Ma, the age interval when the majority of magmas were emplaced. Xenocrystic zircon dates exhibit differences in age populations between individual volcanic-intrusive complexes. A Permo-Triassic population is almost ubiquitous, indicating that basement Permo-Triassic igneous rocks are more widespread than previously thought or that they were significantly involved in the generation of Neogene magmas. However, other observed age populations, such as Triassic or Paleogene have no clear correspondence in the known geological record, indicating the presence of a cryptic component interacting with Neogene magmas.
Supplementary material:
https://doi.org/10.6084/m9.figshare.c.6951429
期刊介绍:
Journal of the Geological Society (JGS) is owned and published by the Geological Society of London.
JGS publishes topical, high-quality recent research across the full range of Earth Sciences. Papers are interdisciplinary in nature and emphasize the development of an understanding of fundamental geological processes. Broad interest articles that refer to regional studies, but which extend beyond their geographical context are also welcomed.
Each year JGS presents the ‘JGS Early Career Award'' for papers published in the journal, which rewards the writing of well-written, exciting papers from early career geologists.
The journal publishes research and invited review articles, discussion papers and thematic sets.