CAMP MAPS AND FIGURES

If you use any of these in publications, be sure to get permission from the author(s) and publisher (you are welcome to mine).  Thanks to Paul Olsen, Andrea Marzoli, Willis Hames, and Ann Heatherington for contributions.

CAMP map  (84 kb) Revised to include dikes and flows in Brazil (Marzoli et al., 1999) and western France (Caroff et al., 1995), plus some sills in Africa (Deckart et al. 1997).  See the explanation for other sources for this figure. LargeCAMP  is a bigger version (549 kb) with many more pixels. Map Explanation  identifies the letter codes for dikes, sills, and basalt areas shown on the figure, and it has a brief discussion on boundaries of CAMP.  My work.

CAMP sketch map by Marzoli et al. (1999), which outlines basaltic sills and lavas in South America and Africa.  For details, see their paper.

Large Igneous Province global map, with CAMP added (modified from Fig. 1 of Coffin and Eldholm, 1994).

Pangaea at 200 Ma, an image constructed by Paul Olsen (also makes a wonderful Windows wallpaper image on a PC).  Notice how the area that will become the central Atlantic straddles the equator.

Northeastern North America IPR lavas (initial Pangaean rift) -- potential extrusive basalt area from the earliest "HTQ" dikes that fed the North Mountain, Talcott, Orange Mountain, and Mt. Zion Church basin basalts (McHone, 1996a).  The map assumes that this dike system emitted the same lava flows both within basins and outside of the basins, and that topography allowed widespread coverage.

Minister Island dike sketch map that is scanned from a figure by Stringer and Burke (1985).  I sampled this dike at Brooks Cove, Maine and also in New Brunswick at point 6 on the map (a roadcut) around 1986, when I called it the Passamaquoddy Bay dike.  It appears to be identical to the Christmas Cove dike, according to my thin sections and the description by Dunn and Stringer (1990).  This dike or similar dikes also occur to the east near Beaver Harbour, New River, and Lepreau River (the last as per recent email from Sandra Barr).

Northern Basins  of the rift zone contain CAMP basalts that can be correlated with specific dike sources.  In particular, the lowest basalt strata are intermediate-Ti quartz tholeiites that are well matched to the Christmas Cove-Higganum dike system of New England, which continues to the south to feed basalts and sills of the Newark-Gettysburg-Culpeper basins (many analyses of this type are given in the data section of this web site).

Rift Zone Sketch is an idealized cartoon of cross-sections across the NE USA and SE USA rift zones, based partly on Philpotts and Martello (1986), McBride (1991), and Oh et al. (1995).  In the north, the basins have been separated by post-basalt tectonism, including both basin down-faulting and regional uplift.  In the South Georgia Rift, most tectonic activity ended before the basalts flowed, so that neither post-basalt uplift (erosion) nor depression (sediment deposition) is evident until the gradual onlap of post-rift Cretaceous coastal plain sediments covered the basalt.  The southern rift basalt underlaps, overlaps or mingles with the seaward-dipping reflector "basalt wedge" in some unclear way (obviously, we wish this was more definitive).  There appears to be a sharp contact between the SDR basalt and the oldest ocean crust (Holbrook and Kelemen, 1993), which might indicate that the ocean crust formed immediately afterward.  Southern basins farther inland (Durham and Danville basins, among others) did undergo erosion before the Cretaceous sedimentation, which removed the basalt flows and any Early Jurassic sediment (if such ever existed).  My work.

Southeastern USA Dikes map contributed by Bill Hames.  Notice how the very wide range of NW-SE dikes, which are mainly Low-Ti/High-Mg olivine tholeiite, overlap with a more restricted swarm of N-S dikes in the Carolinas and Virginia, which are mainly an intermediate-Ti quartz tholeiite type that converges to the south.  See the discussion of this overlap by Ragland et al. (1983).  The NW-SE olivine dike swarm probably continues farther to the southwest under younger cover.  These dikes do NOT radiate around the Blake Plateau; instead, they represent distinct magma types with different tectonic controls on their formation (dikes really are tectonic features as much as magmatic features).

Georgia Dikes and Rift in Georgia, southeastern USA.  I apologize for forgetting where I found this figure of CAMP dikes in Georgia, but I added an outline of the Early Mesozoic rift beneath the younger Coastal Plain strata (McBride, 1991).  The South Georgia Rift is not all basin but rather is a terrane with a series of block faults (not shown).  Most of this rift terrane still contains flood basalts, including southward into Florida and westward into Mississippi and perhaps Texas.  The eastern section contains quartz tholeiites derived from the North-South dike swarm of the Carolinas (Ragland, 1991).  The olivine diabase dikes of Georgia, now exposed in the Piedmont, also extend under the Cretaceous Coastal Plain strata and South Georgia Rift, where they certainly would also be feeders to the rift flood basalt.

South Georgia Rift entire eastern section, another map by Bill Hames (thanks, Bill).  The colored areas of the rift represent interior basins that contain basalt.  Basalt may also run outside of those areas, and the rift terrane probably continues to the west (perhaps wrapping around the Mississippi Embayment, the eastern edge of which is visible here).  All of it is covered by Cretaceous and Cenozoic sedimentary strata.

Florida Subsurface Lithologies  Figure 1 of Heatherington et al. (1999).  The Suwannee terrane within and south of the South Georgia Rift has some features known from drilling and geophysical studies.  Jurassic granite was sampled at locations 119 and 120.  Geophysical feature include TG; Tallahassee graben; BFZ, Bahamas fracture zone; JFZ, Jacksonville fracture zone; FZ, unnamed fracture zone.  Tholeiitic and alkaline Mesozoic basalts in this region are described by Chowns and Williams (1983), Mueller and Porch (1983), Arthur (1988), and Heatherington and Mueller (1991).  Thanks to Ann Heatherington.

The Gulf of Mexico and Caribbean at 200 Ma  A web site page showing one of a series of tectonic maps by James Pindell, dated 2/93.  Notice that he locates CAMP (Newark and Eagle Mills) volcanics across the present-day Gulf of Mexico and well beyond the Florida peninsula.  I assume that the volcanics labeled along the NW edge of South America are subduction-related and not part of CAMP.