Earth's glacial record and its tectonic setting

Eyles, Nicholas

doi:10.1016/0012-8252(93)90002-o

Cited by 405 publications

(239 citation statements)

References 553 publications

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“…It thus appears that these glacial deposits in both northern and southern Namibia are roughly of the same age. Their age, geochemistry, and structural setting support the contention of Eyles (1993), that these glacial deposits are worldwide, often associated with the uplifted flanks of rifted margins. A proposed age of c. 750 Ma for the Kaigas Formation diamictite and its equivalents in the Damara Belt is at the upper end of the age bracket of 700-750 Ma proposed for the Sturtian glacial epoch by Meert and van der Voo (1994).…”

Section: Discussionmentioning

confidence: 59%

New Pb-Pb Single Zircon Age Constraints on the Timing of Neoproterozoic Glaciation and Continental Break-up in Namibia

Frimmel¹,

Klötzli²,

Siegfried³

1996

The Journal of Geology

170

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. Both the stratigraphic position and the geochemistry of the volcanic rocks indicate an early continental rift environ-

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Section: Discussionmentioning

confidence: 59%

New Pb-Pb Single Zircon Age Constraints on the Timing of Neoproterozoic Glaciation and Continental Break-up in Namibia

Frimmel¹,

Klötzli²,

Siegfried³

1996

The Journal of Geology

170

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“…In pre-Phanerozoic times, conspicuous examples of climate change include the Huronian glaciations that lasted from about 2.4 billion years ago to 2.1 billion years ago (24,25) and episodes of glaciation during the latter Neoproterozoic Eon, some of which may have been global in extent (26,27). There are also suggestions of Milankovitch-style cyclicity in the repetitive deposition of distinct sedimentary packages linked to high-frequency sea level fluctuations (28)(29)(30).…”

Section: Significancementioning

confidence: 99%

Orbital forcing of climate 1.4 billion years ago

Zhang

Wang

Hammarlund

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

127

126

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Fluctuating climate is a hallmark of Earth. As one transcends deep into Earth time, however, both the evidence for and the causes of climate change become difficult to establish. We report geochemical and sedimentological evidence for repeated, short-term climate fluctuations from the exceptionally well-preserved ∼1.4-billion-year-old Xiamaling Formation of the North China Craton. We observe two patterns of climate fluctuations: On long time scales, over what amounts to tens of millions of years, sediments of the Xiamaling Formation record changes in geochemistry consistent with long-term changes in the location of the Xiamaling relative to the position of the Intertropical Convergence Zone. On shorter time scales, and within a precisely calibrated stratigraphic framework, cyclicity in sediment geochemical dynamics is consistent with orbital control. In particular, sediment geochemical fluctuations reflect what appear to be orbitally forced changes in wind patterns and ocean circulation as they influenced rates of organic carbon flux, trace metal accumulation, and the source of detrital particles to the sediment.

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“…Conjuntamente a isso, foi encontrada uma grande quantidade de clastos estriados, facetados (incluindo seixos fluviais) e polidos, além de dois grandes clastos (bloco e matacão) em forma de ferro de passar, que normalmente são tidos como evidências de ambientes glaciais (Eyles, 1993). No entanto, não foi possível identificar os pacotes individuais dos diamictitos amalgamados, nem mesmo pavimento estriado ou embasamento deformado, que pudessem indicar a deposição direta por uma geleira e a reclassificação destes diamictitos como tilitos (Eyles, 1983).…”

Section: Ambiente Deposicional Da Formação Serra Azulunclassified