Mesoproterozoic Tasmania: Witness to the East Antarctica-Laurentia connection within Nuna: REPLY
نویسندگان
چکیده
منابع مشابه
A positive test of East Antarctica-Laurentia juxtaposition within the Rodinia supercontinent.
The positions of Laurentia and other landmasses in the Precambrian supercontinent of Rodinia are controversial. Although geological and isotopic data support an East Antarctic fit with western Laurentia, alternative reconstructions favor the juxtaposition of Australia, Siberia, or South China. New geologic, age, and isotopic data provide a positive test of the juxtaposition with East Antarctica...
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Granitic rocks are commonly used as a means to study chemical evolution of continental crust. In particular, their isotopic compositions reflect the relative contributions of mantle and crustal sources in their genesis. In Laurentia, a distinctive belt of Mesoproterozoic A-type or “anorogenic” granites of ∼1.4 Ga age was emplaced within composite, heterogeneous Proterozoic crust. Zircons are an...
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The existence of a pre-Rodinia Precambrian supercontinent, variously called Nuna or Columbia, has been widely speculated in the past decade, but the precise timing of its existence and its configuration have been uncertain due to the lack of unequivocal paleomagnetic and geological constraints. Here we report high-quality paleomagnetic results from the well dated 1780 Ma Xiong’er Group in south...
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We thank Wilcock [this issue] and Millar and Rennie [this issue] for their keen interest in our work and for the opportunity to clarify our model framework and results. While they make many valuable suggestions and addendums to our research, many of their objections are based on misinterpretation of our thesis and extension of our findings beyond their intended scope. We hope that our responses...
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Force-balance calculations on Byrd Glacier, East Antarctica, reveal large spatial variations in the along-flow component of driving stress with corresponding sticky spots that are stationary over time. On the large scale, flow resistance is partitioned between basal (�80%) and lateral (�20%) drag. Ice flow is due mostly to basal sliding and concentrated vertical shear in the basal ice layers, i...
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ژورنال
عنوان ژورنال: Geology
سال: 2016
ISSN: 0091-7613,1943-2682
DOI: 10.1130/g37740y.1