Multi-proxy evidence for tectonic control on the expansion of C4 grasses in northwest Argentina
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- 作者：Jennifer M. Cotton ; jen.cotton@utah.edu" class="auth_mail ; Ethan G. Hyland ; Nathan D. Sheldon
- 关键词：C4 grasses ; stable isotopes ; phytoliths ; Andes
- 刊名：Earth and Planetary Science Letters
- 出版年：1 June 2014
- 年：2014
- 卷：395
- 期：Complete
- 页码：41-50
- 全文大小：1069 K
文摘
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We reconstruct C3/C4 paleovegetation from northwest Argentina from 6.2–3.3 Ma.
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We use both the si1" class="mathmlsrc">si1.gif&_user=111111111&_pii=S0012821X14001587&_rdoc=1&_issn=0012821X&md5=113cb472f8b1a5d6ae5f5f9b73487190">
si1.gif"> of soil organic matter and phytoliths preserved in paleosols.- •
Both methods show an expansion of C3 grasses during the Miocene rise of C4 grasses.
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The Andes uplift caused a climatic cooling which drove C3 grasses to outcompete C4.
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The modern ecosystem was in place in northwest Argentina by 3.5 Ma.