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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/11594
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- Title
- Widespread Archean basement beneath the Yangtze craton
- Related
- Geology, Vol. 34, Issue 6, p.417-420
- DOI
- 10.1130/G22282.1
- Publisher
- Geological Society of America
- Date
- 2006
- Author/Creator
- Zheng, Jianping
- Author/Creator
- Griffin, W. L
- Author/Creator
- O'Reilly, Suzanne Y
- Author/Creator
- Zhang, Ming
- Author/Creator
- Pearson, Norman
- Author/Creator
- Pan, Yuanming
- Description
- The age distribution of the crust is a fundamental parameter in modeling continental evolution and the rate of crustal accretion through Earth's history, but this is usually estimated from surface exposures. The exposed Yangtze craton in eastern China consists mainly of Proterozoic rocks with rare Archean outcrops. However, the U-Pb ages and Hf isotope systematics of xenocrystic zircons brought to the surface in lamproite diatremes from three Proterozoic outcrop areas of the craton suggest the widespread presence of unexposed Archean basement, with zircon age populations of 2900–2800 Ma and 2600– 2500 Ma and Hf model ages of 2.6 to ca. 3.5 Ga or older. The zircons also record thermal events reworked on the craton ca. 2020 Ma (remelting of older crust) and 1000–850 Ma (addition of juvenile mantle material). The observation of deep crust significantly older than the upper crust will require revision of models for the rates of crustal generation through time.
- Description
- 4 page(s)
- Subject Keyword
- 040200 Geochemistry
- Subject Keyword
- 040300 Geology
- Subject Keyword
- crustal evolution
- Subject Keyword
- Hf isotopes
- Subject Keyword
- zircon geochronology
- Subject Keyword
- deep-crustal xenocryst
- Subject Keyword
- Archean basement
- Subject Keyword
- Yangtze craton
- Resource Type
- journal article
- Organisation
- Macquarie University. National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC)
- Identifier
- http://hdl.handle.net/1959.14/11594
- Identifier
- mq:1233
- Identifier
- ISSN:0091-7613
- Identifier
- mq-rm-2006000144
- Language
- eng
- Reviewed
Macquarie University ResearchOnline
