TABLE OF CONTENTS
Page
Abstract ............................................... .................vii
A cknow ledgem ents .............. ...................................................viii
Introduction ........................................... ................... 1
M etric C onversion Factors .............. .............................................. 1
Part I Petrogenesis of Early Mesozoic tholeiite in the Florida basement ......................... 2
Background ............................................ ................ 2
Age .................................................. .............. 2
Classification .......................................................... 3
Distribution ............................................ ............... 6
Petrography ................................................................ 11
Sam pling and Analytical M ethods ............. ......................................12
Results ................................................................12
Discussion ............................................. ...............17
Petrogenesis ............ .............................................. ....... 17
Association .................................................. ........ 19
C o nc lusio n s . .. . .. . . .. . . . .. . . .. . .. . .. . . .. . . .. . . . . .. . .. 2 7
R efe re nces . .. ... .. .. . . .. . . . .. . . .. . .. . . .. . . .. . . . . . .. . . ..2 8
A p p e n d ic e s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Petrographic data .................................................. 31
2. Analytical accuracy and precision ................................................. 32
Part II An overview of Florida basement geology ............ ..............................33
Discussion ............................................. ...............33
References .............................................. ..............38
ILLUSTRATIONS
PART I Page 1. Oil test well locations that have encountered diabase and basalt ........................... 5
2. Lithology of the pre-Middle Jurassic Florida basement surface ............................. 9
3. Florida basement (pre-Middle Jurassic) tectonic features .......... ...................... 10
4. Mafic index (MI = Fe203*/Fe20a3* + MgO) plotted versus TiO2 ............................ 14
5. Stacked plot of selected major and trace elements versus mafic index ...................... 15
6. Pearce and Cann (1973) Ti Y Zr discrimination diagram ............................... 20
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