Geochronology of the Baye Mn oxide deposit, southern Yunnan Plateau: Implications for the late Miocene to Pleistocene paleoclimatic conditions and topographic evolution

Abstract

Please cite this article as: Deng, X-D., Li, J-W., Vasconcelos, P.M., Cohen, B.E., Kusky, T.M., Geochronology of the Baye Mn oxide deposit, southern Yunnan Plateau: implications for the late Miocene to Pleistocene paleoclimatic conditions and topographic evolution, Geochimica et Cosmochimica Acta (2014), doi: http://dx.doi.org/10.1016/ j.gca. 2014.04.036 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Evolutionary dynamics and biogeography of Musaceae reveal a correlation between the diversification of the banana family and the geological and climatic history of Southeast Asia

“…; Hall, , , ), together with the recent Plio‐ and Pleistocene gradual cooling and accompanying climatic fluctuations (Wurster et al ., ), shaped the current biodiversity in both regions (Lohman et al ., ). Whereas the northern Indo‐Burmese region was probably characterized by a rather steady relatively warm and humid climate from the late Oligocene that could support broad‐leaved evergreen vegetation (Deng et al ., ), Malesia experienced frequent habitat contraction and expansion caused by sea level fluctuations and different regional responses to cyclic climatic changes. In addition, most of the current Malesian landmass only rose above sea level from the early Miocene onwards as a result of the collision of the Sunda and the Sahul Shelf (Hall, , ; Lohman et al ., ; de Bruyn et al ., ).…”

“…Speciation rates appear to be similar between species of both regions, although an increased speciation rate for the Malesian Musa species was expected because of increased connection-disconnection events related to sea level fluctuations (de Bruyn et al, 2014). The low extinction rate for northern Indo-Burmese Musa species corresponds well with the stable warm and humid climate that has occurred in northern Southeast Asia since the late Oligocene-early Miocene, and in which evergreen broad-leaved forests have probably been continuously present (Yunnan Bureau of Geology and Mineral Resources, 1990;Deng et al, 2014). The increased extinction rate of the Malesian Musa species might be associated with the periodic Pleistocene inundation of the Sunda Shelf and the subsequent loss of suitable habitat.…”

“…Although the enormous plant biodiversity in Southeast Asia can be partly ascribed to its current geographic position in tropical and subtropical climatic zones, it is especially the region's complex tectonic and climatic evolution that has shaped the present species richness and high degree of endemism (Sodhi et al, 2004;Woodruff, 2010;Wong, 2011). When geographically and climatically comparing mainland Indo-Burmawith its northern boundary situated in the tropical area of Yunnan (Southwest China)with the islands of Sunda and Sahul, it is clear that their evolutionary history is remarkably different, despite being part of the same large Southeast Asian geographic region (de Bruyn et al, 2014;Deng et al, 2014). The northern area of tropical Southeast Asia (further referred to as northern Indo-Burma), despite its high latitude and elevation, has a tropical moist climate.…”

Long‐term responses of leaf litter decomposition to temperature, litter quality and litter mixing in plateau wetlands

“…The surface water in these wetlands flows underground only through funnels, creating typical closed and half-closed wetlands (Tian et al, 2015). Due to their isolation and closure, these plateau wetlands are very fragile and are vulnerable to human activities and natural environment changes and will be difficult to restore once they have degenerated (Xiao, Tian & Zhang, 2008;Deng et al, 2014;Liu et al, 2016).…”

The Paleoclimatic Signatures of Supergene Metal Deposits

“…This history is intermittent, revealing a close link between the evolution of weathering profi les and global climatic conditions. Many 40 Ar/ 39 Ar geochronological studies of Mn deposits in Africa (Beauvais et al 2008), Australia (Dammer et al 1999;Li and Vasconcelos 2002;Vasconcelos 2002;Feng and Vasconcelos 2007;Vasconcelos et al 2013), China (Li et al 2007;Deng et al 2014), India (Bonnet et al 2014), and Europe (Hautmann and Lippolt 2000) now reveal comparable histories, where intermittent weathering and mineral precipitation throughout the entire Cenozoic suggests alternating wet and dry periods that, in turn, refl ect global climatic conditions (FIG. 4 A-D).…”