干旱区生态环境知识资源中心(Arid): Earlier onset of the Early Cretaceous Equatorial humidity belt

Arid

DOI	10.1016/j.gloplacha.2021.103724
	Earlier onset of the Early Cretaceous Equatorial humidity belt
	Santos, Alessandra; De Lira Mota, Marcelo A.; Kern, Henrique P.; Fauth, Gerson; Paim, Paulo S. G.; Netto, Renata G.; Sedorko, Daniel; Lavina, Ernesto Luiz C.; Krahl, Guilherme; Fallgatter, Claus; da Silveira, Deise Marli; Aquino, Carolina D.; dos Santos, Marinez O.; Baecker-Fauth, Simone; Vieira, Carlos Eduardo L.
通讯作者	Santos, A (corresponding author)，Univ Vale Rio dos Sinos, Itt Oceaneon, Inst Tecnol Paleoceanog & Mudancas Climat, Ave Unisinos 950, BR-93022750 Sao Leopoldo, RS, Brazil.
来源期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
EISSN	1872-6364
出版年	2022
卷号	208
英文摘要	The long-standing view on the Cretaceous climate zones suggests the inception of an Equatorial Humid Belt (EHB) in the Albian. This inception contrasts with recent sedimentological and palynological evidence of sustained low-latitude, wetter paleoenvimnment in the South American and African landmasses during the Aptian. The trigger for this early-stage EHB stands on two hypotheses: [1] the first major marine incursions to the equatorial Gondwana; [2] the southward displacement of a proto-Intertropical Convergence Zone (ITCZ). We provide new palynological, ichnological, and sedimentological data from the Codn Formation obtained from borehole 2-ANP-5-MA, drilled in the Sao Luis Basin, Brazilian equatorial margin. This integrated analysis allowed recovering well-preserved palynomorph assemblages of the upper Aptian Codn Formation. Based on three palynomorph-based climate indicators (sporomorph genera richness, the relative abundance of reworked palynomorphs, and climate-indicative palynofloras), and independent climate-indicative sedimentological indicators, our results show an interval of increasingly humid climate, which precedes the first major marine incursion. It also confirms that sporomorph genera richness scales directly with precipitation levels. Based on that, we reconstructed coeval late Aptian humidity patterns from thirteen South American and African sedimentary basins. Our findings support the establishment of the EHB in the late Aptian and challenge the view of a dominantly arid Equatorial Gondwana before the Albian. We argue that decreasing Proto-North Atlantic/South Atlantic seasurface temperature (SST) gradient may have triggered a southward EHB displacement, leading to wetter, low-latitude biomes with broad and complex ecosystems. For the first time, a plausible mechanism is raised to explain the linkage between changing interhemispheric SST gradient and the dynamics of a pmto-ITCZ in the Early Cretaceous.
英文关键词	Aptian Sao Luis basin ITCZ dynamics Meridional temperature gradient Climate changes Palynomorphs
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000740500600001
WOS关键词	NORTHEASTERN BRAZIL ; CLIMATE ; BASIN ; VEGETATION ; CYCLES ; ENVIRONMENTS ; EXAMPLE
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/376882
作者单位	[Santos, Alessandra; De Lira Mota, Marcelo A.; Kern, Henrique P.; Fauth, Gerson; Krahl, Guilherme; Baecker-Fauth, Simone] Univ Vale Rio dos Sinos, Itt Oceaneon, Inst Tecnol Paleoceanog & Mudancas Climat, Ave Unisinos 950, BR-93022750 Sao Leopoldo, RS, Brazil; [Fauth, Gerson; Paim, Paulo S. G.; Netto, Renata G.; Lavina, Ernesto Luiz C.; dos Santos, Marinez O.] Univ Vale Rio dos Sinos, Programa Posgrad Geol, Ave Unisinos 950, BR-93022750 Sao Leopoldo, RS, Brazil; [Sedorko, Daniel] Univ Fed Uberlandia UFU, Lab Paleontol Estratig, Av 15 Novembro 501, BR-38500000 Monte Carmelo, MG, Brazil; [Fallgatter, Claus] Univ Fed Pernambuco UFPE, Ctr Tecnol & Geociencias, LAGESE LITPEG, Av Acad Helio Ramos S-N, BR-50740530 Recife, PE, Brazil; [da Silveira, Deise Marli] Univ Fed Parana UFPR, Dept Geol, Programa Posgrad Geol, Av Cel Francisco Heraclito Santos, BR-81531980 Curitiba, PR, Brazil; [Aquino, Carolina D.] Univ Fed Parana UFPR, Lab Anal Bacias LABAP, Av Cel Francisco H Santos, BR-81270460 Curitiba, PR, Brazil; [Vie...
推荐引用方式 GB/T 7714	Santos, Alessandra,De Lira Mota, Marcelo A.,Kern, Henrique P.,et al. Earlier onset of the Early Cretaceous Equatorial humidity belt[J],2022,208.
APA	Santos, Alessandra.,De Lira Mota, Marcelo A..,Kern, Henrique P..,Fauth, Gerson.,Paim, Paulo S. G..,...&Vieira, Carlos Eduardo L..(2022).Earlier onset of the Early Cretaceous Equatorial humidity belt.GLOBAL AND PLANETARY CHANGE,208.
MLA	Santos, Alessandra,et al."Earlier onset of the Early Cretaceous Equatorial humidity belt".GLOBAL AND PLANETARY CHANGE 208(2022).