The '''Marinoan glaciation''', sometimes also known as the '''Varanger glaciation''',<ref name="PazosEtAl2003">{{cite journal |last1=Pazos |first1=Pablo J. |last2=Sánchez-Bettucci |first2=Leda |last3=Tofalo |first3=Ofelia R. |date=January 2003 |title=The Record of the Varanger Glaciation at the Río De La Plata Craton, Vendian-Cambrian of Uruguay |url=https://www.sciencedirect.com/science/article/abs/pii/S1342937X05706444 |journal=[[Gondwana Research]] |volume=6 |issue=1 |pages=65–77 |doi=10.1016/S1342-937X(05)70644-4 |bibcode=2003GondR...6...65P |access-date=16 October 2022}}</ref> was a period of worldwide [[glaciation]].<ref thatname="RooneyEtAl2015" lasted/> fromIts approximatelybeginning 650is topoorly 632.3constrained, ±but 5occurred no earlier than 654.95 [[Megaannum|Ma]] (million years ago).<ref>{{cite journal |last1=Ma |first1=Xiaochen |last2=Wang |first2=Jiasheng |last3=Wang |first3=Zhou |last4=Algeo |first4=Thomas J. |last5=Chen |first5=Can |last6=Cen |first6=Yue |last7=Yin |first7=Qing-Zhu |last8=Huang |first8=Chang |last9=Xu |first9=Liyuan |last10=Huang |first10=Chao |last11=Chen |first11=Dahe |date=March 2023 |title=Geochronological constraints on Cryogenian ice ages: Zircon Usingle bondPb ages from a shelf section in South China |url=https://www.sciencedirect.com/science/article/abs/pii/S0921818123000449 |journal=[[Global and Planetary Change]] |volume=222 |doi=10.1016/j.gloplacha.2023.104071 |access-date=1 June 2023}}</ref> It ended approximately 632.3 ± 5.9 Ma<ref name="RooneyEtAl2015">{{cite journal|last1=Rooney|first1=Alan D.|last2=Strauss|first2=Justin V.|last3=Brandon|first3=Alan D.|last4=Macdonald|first4=Francis A.|year=2015|title=A Cryogenian chronology: Two long-lasting synchronous Neoproterozoic glaciations|journal=[[Geology (journal)|Geology]]|volume=43|issue=5|pages=459–462|bibcode=2015Geo....43..459R|doi=10.1130/G36511.1}}</ref> during the [[Cryogenian]] [[geologic period|period]]. This glaciation possibly covered the entire planet, in an event called the [[Snowball Earth]]. The end of the glaciation was caused by volcanic release of [[carbon dioxide]] and dissolution of [[gas hydrates]]<ref>{{cite journal |last1=Sun |first1=Ruiyang |last2=Shen |first2=Jun |last3=Grasby |first3=Stephen E. |last4=Zhang |first4=Jiawei |last5=Chen |first5=Jianshu |last6=Yang |first6=Chuang |last7=Yin |first7=Runsheng |date=December 2022 |title=CO2 buildup drove global warming, the Marinoan deglaciation, and the genesis of the Ediacaran cap carbonates |url=https://www.sciencedirect.com/science/article/abs/pii/S0301926822003357 |journal=[[Precambrian Research]] |volume=383 |page=106891 |doi=10.1016/j.precamres.2022.106891 |s2cid=253430013 |access-date=17 December 2022}}</ref> and might have been hastened by the release of [[methane]] from equatorial [[permafrost]].<ref>{{Cite journal | last1 = Shields | first1 = G. A. | title = Palaeoclimate: Marinoan meltdown | doi = 10.1038/ngeo214 | journal = Nature Geoscience | volume = 1 | issue = 6 | pages = 351–353 | year = 2008 | bibcode = 2008NatGe...1..351S }}</ref><ref>{{Cite journal | doi = 10.1038/nature06961| title = Snowball Earth termination by destabilization of equatorial permafrost methane clathrate| journal = [[Nature (journal)|Nature]]| volume = 453| issue = 7195| pages = 642–5| year = 2008| last1 = Kennedy | first1 = M. | last2 = Mrofka | first2 = D. | last3 = von Der Borch | first3 = C. | pmid=18509441| bibcode = 2008Natur.453..642K| s2cid = 4416812}}</ref>
