Search

Pb stepwise leaching of tourmaline from the Palaeoproterozoic Western Fold Belt of the Mount Isa Inlier yield dates of 1559±17 Ma, 1577±52 Ma and 1480±90 Ma. Structural, petrological and textural data suggest that 1559±17 Ma is the best estimate for peak metamorphism in the area. Estimates of Pb closure temperature and comparison with peak metamorphic temperatures indicate that this age represents tourmaline crystallisation. These dates represent syn-metamorphic fluid flow and indicate metal mobility during the Isan Orogeny. A result of this event is regional-scale silicification that has the same relative timing as extensive silica deposition in the rocks that now host the Cu orebodies at Mount Isa. [ABSTRACT FROM AUTHOR]

A chapter from the book "Between the Cracks of History: Essays on Teaching and Illustrating Folklore" is presented. It discusses meteor shower which was referred as the night the stars fell. It states that meteor shower is widely observed in almost all of the eastern part of the U.S. It states that Sioux Indians were able to document the 1833 meteor shower through the buffalo skin painting they made. The author states that the meteor shower on November 13, 1833 was the most universal and wonderful meteor shower event which has ever been recorded.