Zur Navigation | Zum Inhalt
     
 
Slice 2: Sauk II - Middle Cambrian Dresbachian 511-497 Ma Detail of Siberian Terrane PDF Print E-mail

Map

Map :  Detail of Siberian Terrane

Earth History Maps of professor Jan Golonka 

This was a quiet time without any major collisions, but of a continuing sea-level rise. The continents of Gondwana, Baltica, Laurentia and Siberia continued their existence. Siberia and Laurentia drifted northward coming close to the equator (Figs 2, 3).

Convergent Tectonics

Some of the late Vendian/ Early Cambrian events may have reached a conclusion at this time, like the Damara Orogeny (Miller, 1983; Henry at al., 1990; Tankard et al., 1995) in southern Africa or the orogenic events in the Ural, Timan-Pechora, Novaya Zemlya, and Pay- Khoy areas on the northeastern margin of Baltica. The collision of the Trans-Ural microcontinent with Baltica in the Ural area (Zonenshain et al., 1990) was perhaps related to adjustment of continents during the drifting stage. The subduction zone along the margin of Gondwana between Northwestern South America and the Chinese terranes, and the subduction zone located north of western Laurentia, Arctic plates and Siberia continued to develop.

Extensional Tectonics

Advanced seafloor spreading occurred in the Iapetus-Tornquist ocean between Laurentia and Baltica, and in the Phoibic Ocean between Laurentia and Gondwana (McKerrow et al., 1991; Torsvik et al.; 1996, Dalziel, 1997). Laurentia rapidly drifted northward and rotated counter-clockwise, reaching low latitudes. Seafloor spreading also occurred within the Pleionic Ocean between East Siberia and Baltica. Rifting events occurred along the Northern Urals and Pay Khoy belts on the eastern margin of Baltica (Nikishin et al., 1996), perhaps following the orogenic events mentioned above. The relationship between Laurentia and Siberia, including the mapped strike-slip, remains quite speculative (Fig.3). Extensive continental rifting occurred in Gondwana (e.g., East Arabian plate), East Siberia and Avalonia. In Laurentia intracontinental rifting affected the Wichita Mountains area in  Oklahoma (Hamilton, 1989). Back-arc spreading in eastern Australia could have happened at this time (Powell et al., 1990, Veevers & Powell, 1990).

Sea Level and Climate

Sauk II was a time of continuous global sea level rise, related to advanced drifting of the continents and significant subsidence and submergence of most continental margins. Warm, humid climatic conditions, limited continental aridity, and no known continental glaciation exemplified the time of transition from icehouse to greenhouse conditions. The northward drift of Laurentia placed this continent in low latitudes. The global Ocean Anoxic Event (OAE), during the Middle and Late Cambrian, is related to climatic and sea-level conditions.

Carbonate Sedimentation

Carbonate deposition at that time was widespread, with carbonate platform occurrences distributed between 40oN and 60oS latitudes. Carbonate depositional systems, located along narrow continental margins or on isolated platforms typically consisted of oolitic grainstone-bearing, shallowing-upward depositional sequences that contain or are capped by peritidal dolomites.

Siberia was almost completely submerged (Fig. 3) and was characterized by shaly carbonate sediment accumulation which continued from the previous time slice (Puchkov, 1996). Carbonate and mixed carbonate/clastic facies were widespread in the northern part of North America and proto-Arctic area (Ronov et al., 1984). Carbonates also appeared on eastern North America margins, in connection with the Laurentia drift to the lower latitudes. large carbonate platform existed on the South China plate (Shouxin Yongyi, 1991) and was connected with the carbonate deposition area on the Arabia plate margin (Ronov et al., 1984). Mixed carbonate/clastic facies prevailed in South-East Asia (Brookfield, 1996). Carbonates are present within terrigenous complexes in the northern India-Himalayan area (Gupta & Brookfield, 1991). Carbonate/evaporite sediments were deposited on the Gondwanian margins in South America. Carbonate and mixed carbonate/clastic facies also occurred in Eastern Australia (Cook, 1990).

 
< Prev   Next >
 
     
cheapest prices for viagra
buy cialis fedex shipping
cheap cialis india
cialis next day
propeci a sale
ordering viagra overnight delivery
levitra online prescription
viagra brand
discount levitra online us
propecia 5mg
viagra seizures
purchase cialis next day delivery
china viagra
cheap levitra uk
cialis fast delivery
viagra discounts
discount levitra online viagra
cialis online canada

cheap viagra on line
puchase propecia online
real viagra online
cialis discount
canadian pharmacy with lowest generic viagra

best viagra and popular in uk
viagra rx in canada
cialis for woman
buy levitra vardenafil
cialis tablets foreign
brand cialis for sale
cialis by mail
china viagra
get levitra
buy propecia 5mg online uk
viagra femele
real viagra online
levitra online us
pharmacy support viagra
cialis no prescription
natural levitra
lowest price for levitra
100 mg viagra
cialis dosagem
discount real viagra
pfizer viagra
viagra mexico
buy viagra online without prescription
best online levitra
cheapest viagra online
levitra from canada
canadian pharmacy viagra legal
cialis 30 mg
what better viagra or cialis
is pfizer viagra available in india
canadian viagra and healthcare
cost of viagra in germany
cialis cost
overnight delivery viagra
50 mg cialis
buying cialis online
cheap propecia uk
cialis next day
viagra through canada
buy cialis next day delivery
viagra soft tabs
best online cialis
how much is viagra
generic propecia canada
get cialis
buy cialis without prescription
buy real cialis
purchase cialis cheap
cialis cost
cheapest prices on viagra
purchase real name brand viagra
growth hair propecia
100mg generic viagra
real viagra without prescription
generic levitra vardenafil

generic cialis canadian
cialis professional
cialis samples in canada
buy cialis without a prescription
real viagra online
propecia without a prescription
cialis price in canada
once daily cialis
mexico pharmacy cialis
online pharmacy propecia sale
generic levitra purchase
cialis online without prescription
buy cialis fedex shipping
viagra no prescriptions
cialis canada illegal buy
overnight viagra
purchase propecia
canada viagra
viagra online
real viagra without prescription
viagra best online store canada
generic cialis in india
best way to take cialis
canadian pharmacy viagra legal
viagra overnight
generic viagra made in usa
generic cialis sale
get propecia cheap
cialis generico
cialis refractory
viagra overnight delivery
canadian pharmacy cialis pfizer
canadian pharmacy cialis pfizer
viagra 100mg england
cialis for sale
viagra pfizer canada
sale propecia
order usa viagra online
buy generic levitra online
ordering viagra online
online viagra scams
brand name cialis
buying cialis soft tabs 100 mg
buy propecia online prescription

cialis order
buying viagra with no prescription
buy propecia pills

cialis and canada custom
cheap canadian viagra
viagra pfizer canada
natural viagra pills
levitra presciptions online
gerenic cialis
selling propecia online
buy viagra now
cialis price
viagra in spain
how to get viagra
100 mg cialis
canada meds viagra
5mg propecia
uk propecia sales
lowest priced propecia
cialis 100 mg
cialis at real low prices
combine cialis and levitra
online pharmacy cialis brand
buy viagra china
viagra 50mg
generic cialis next day delivery
canada levitra

viagra pfizer online
levitra 10mg
us cialis
cialis london delivery
canadian pharmacy with lowest generic viagra
where to find cialis
buy cialis without a prescription
cialisis in canada
viagra tablet weight
viagra sales canada
how can i get some cialis
cialis kanada
pfizer mexico viagra
cialis brand

generic propecia india
cialis canada illegal buy
online cialis
canadian viagra
buy viagra pills

female viagra pills
indian cialis
canadian women viagra
female viagra
healthcare canadian pharmacy
best price generic propecia
discount cialis
generic cialis canadian
levitra low price
get levitra online
cheap online levitra
levitra lowest price
real viagra without prescription
viagra 50mg
we deliver to canada viagra
cialis discount
viagra non prescription
brand name cialis
cheap viagra online
cheapest propecia in uk
levitra vs viagra

online pharmacy propecia viagra
cialis price
cialis price in canada
what better viagra or cialis
viagra femele
mexico levitra
levitra without prescriptions
cialis 5 mg
cialis delivered overnight
viagra rx
buying online propecia
online levitra tablet
cialis usa
generic viagra online
canadian pharmacy discount code viagra
gele viagra
buy cialis without rx
canadian meds

cheap viagra no prescription
buy viagra in canada no prescription
canadian pharmacy cialis
brand viagra over the net
propecia for sale

cialis one a day
cialis 20mg
cialis soft pills
woman and cialis
cialis buy
canadian generic viagra on line
buy propecia online pharmacy
bio viagra herbal
generic form of propecia
pfizer viagra cheap
daily cialis
cialis overnight delivery
cialis delivered overnight
cialis from mexico
50mg viagra retail price
get cialis
viagra buy