TABULAR DATA FOR DIKES, SILLS, BASALTS, AND PROVINCES

Stay tuned for much more material to be added!

Comparisons Table  shows average compositions of the earliest dikes and correlative basalts that occur in northeast North America and northwest Africa, plus three others from Atlantic Canada  -- the Caraquet, Shelburne, and Avalon dikes.  I believe that the Caraquet dike of New Brunswick and Maine is the same magma as the Buttress-Ware dike of southern New England (the second intrusion and flow, subsequent to the initial system shown in this table).  The Shelburne and Avalon dikes are independent magmas whose lava products are no longer exposed.  Each basalt is listed beneath the dike that is a possible source.  Names: York Haven dike, Palisades sill, Higganum dike, Christmas Cove dike, Minister Island dike, Messejana dike, Caraquet dike, Shelburne dike, Avalon dike, Mt. Zion Church basalt, Orange Mountain basalt, Talcott basalt, North Mountain basalt, and the lower basalt from a basin in Morocco.

LIP Sizes Table  compares several other flood basalt provinces with CAMP.

USGS Geochemical Data  presents analyses of diabase (dikes, sills, and "sheets") associated with early Mesozoic basins of the eastern USA, from Gottfried et al., 1991, Open File Report OFR91-322J.   These are all intrusives, not extrusive basalts (lavas).  They are subdivided by basin name, with combination descriptive text and data files (my scan with OCR, watch for errors).  There are eight data files, each with a descriptive text file.  The report includes full-size quadrangle maps showing the sampled sheets and dikes, but I have no easy way to digitize or display such large graphics files.  If you really want location details, let me know and I will mail you a photocopy or two.  Thanks to Jeff Grossman for permission to post these data.

Mass and Volatile Estimates  for CAMP that were calculated from rough map measurements of areas that basalts occur within four continents.  Plenty of room for error, but it looks like 10 million square km is in the ballpark for CAMP.  Assuming half was covered by lavas with an average thickness of 200 m (perhaps too conservative), and assuming the east coast margin igneous province (ECMIP) -- the seaward dipping reflector or wedge basalts -- is contemporaneous at 2000 km long by 55 km wide by 25 km thick (half being subaerial), then we get a total volume of about 2.38 million km3.  Using averages from the USGS chemical data bank listed above, and assuming half of the volatile contents are liberated at the fissure eruption vents (also very conservative), we get 1 to 3 E+12 (12 zeroes!) metric tons of volatiles such as CO2, S, F, and Cl.  An astounding mass of gaseous emissions!