Richard Harry Bruce

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Questions related from Richard Harry Bruce

Location of seas prior to the Cambrian marine transgression?

What evidence is there today for the locations of seas that existed prior to the Cambrian marine transgression onto the continents? eg: Narrow Precambrian seaways (Carey)? or Precambrian oceanic...

10 October 2022 6,821 0 View

Granulite-gneiss rocks relationship to low-grade provinces?

In North America, for example: 1. Archean provinces (eg Superior Craton) have high-grade granulite-gneiss and low-grade granite-greenstone. 2. Earlier Paleoproterozoic has high-grade...

23 May 2018 7,218 5 View

Thermal-tectonic mega-Events - why were there global episodes?

Four global episodes are correlatable with Kenoran, Hudsonian, Grenvillian and Pan-African Events in North America. Radiogenic heat and thermal blanketing by continental crust may be factors in...

25 April 2018 1,966 13 View

Neoproterozoic Oxygenation, but not of the atmosphere?

Is it possible that the Neoproterozoic Oxygenation Event is not about significant increase of oxygen in the atmosphere? Instead could it just be about upwelling/turnover of deeper water anoxic...

01 January 1970 4,722 2 View