T. Slagstad, Michael R.M. Easton, Magdalena H. Huyskens, N. Culshaw
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The Central Gneiss Belt of the SW Grenville Province in Ontario has a relatively well-understood orogenic architecture and records active-margin growth and reworking between ca. 1900–1200 Ma. We present U–Pb and Hf isotope data of zircon from 30 orthogneiss samples ranging in age from ca. 1750 to 1250 Ma, covering all tectonostratigraphic levels of the Central Gneiss Belt. As expected, the detrital and igneous datasets display many of the same overall features, such as crustal growth along the SW Laurentian active margin; however, there are also some distinct differences. In particular, sedimentation appears to have taken place near the active margin, with little or no input from distal inboard sources, thus missing this significant component of reworked crust. 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引用次数: 0
摘要
对碎屑岩锆石和火成岩锆石进行 U-Pb 和 Hf 同位素综合分析,可提供有关地壳增生与再加工随时间变化的信息。然而,仅从少量样本中获得的碎屑锆石数据可以提供有关造山活动长时期的信息,但这种方法缺乏研究火成岩锆石所需的地质背景,可能无法记录中、深地壳来源或与沉积地点隔离的来源。相反,火成岩锆石很可能会遗漏被后来的构造活动移走的矿源,但这些矿源可能保留在碎屑记录中。安大略省西南格勒维尔省的中央片麻岩带具有相对完善的造山构造,记录了约 1900-1200 Ma 之间的活动边缘增长和再加工。我们展示了来自 30 个正长片麻岩样本的锆石的 U-Pb 和 Hf 同位素数据,这些样本的年龄从大约 1750 到 1250 Ma 不等,涵盖了中央片麻岩带的所有构造地层层位。正如预期的那样,碎屑岩数据集和火成岩数据集显示出许多相同的总体特征,例如沿劳伦伦西南部活动边缘的地壳增长;但是,也存在一些明显的差异。特别是,沉积似乎是在活动边缘附近进行的,很少或根本没有来自远端内侧来源的沉积,因此缺少了再造地壳的这一重要组成部分。这项研究突出表明,需要将碎屑岩样本和火成岩样本结合起来,才能最全面地了解长寿命增生造山系统。
Complementarity of Hf isotopes from detrital and igneous zircon: an example from the Central Gneiss Belt, Grenville Province, Ontario
Combined U–Pb and Hf isotopic analysis of detrital and igneous zircon provides information about variations in crustal addition vs. reworking through time. However, whereas detrital zircon data from only a few samples can provide information about extended periods of orogenic activity, this approach lacks the geological context that comes with studying igneous zircon and may not record mid- and deep-crustal sources or sources isolated from sites of deposition. Conversely, igneous zircon is likely to miss sources that were removed by later tectonic activity, but which may be preserved in the detrital record. The Central Gneiss Belt of the SW Grenville Province in Ontario has a relatively well-understood orogenic architecture and records active-margin growth and reworking between ca. 1900–1200 Ma. We present U–Pb and Hf isotope data of zircon from 30 orthogneiss samples ranging in age from ca. 1750 to 1250 Ma, covering all tectonostratigraphic levels of the Central Gneiss Belt. As expected, the detrital and igneous datasets display many of the same overall features, such as crustal growth along the SW Laurentian active margin; however, there are also some distinct differences. In particular, sedimentation appears to have taken place near the active margin, with little or no input from distal inboard sources, thus missing this significant component of reworked crust. This study highlights the need for a combination of detrital and igneous samples in order to provide the most complete picture of long-lived accretionary orogenic systems.
期刊介绍:
The Canadian Journal of Earth Sciences reports current research in climate and environmental geoscience; geoarchaeology and forensic geoscience; geochronology and geochemistry; geophysics; GIS and geomatics; hydrology; mineralogy and petrology; mining and engineering geology; ore deposits and economic geology; paleontology, petroleum geology and basin analysis; physical geography and Quaternary geoscience; planetary geoscience; sedimentology and stratigraphy; soil sciences; and structural geology and tectonics. It also publishes special issues that focus on information and studies about a particular segment of earth sciences.