| | TR-160 TECHNICAL REPORT MARINE MAGNETIC SURVEY OFF THE SOUTHERN BAHAMAS PROJECT M-15 DEWEY R. BRACEY and OTIS E. AVERY Geomagnetics Branch Marine Surveys Division JULY 1963 | ee aie 743 aa U.S. NAVAL OCEANOGRAPHIC OFFICE | pw. TR [60 WASHINGTON, D. C. 20390 | PRICE 40 CENTS ABSTRACT A detailed geomagnetic and bathymetric survey of an 18,000-square-mile area off the southern Bahama Islands has revealed three distinctive magnetic lineations. These extensive magnetic features may indicate that the area is the focus of three major faults or fault zones. MBL/WHO!I MON FOREWORD An important aspect of any oceanographic study is the delineation and interpretation of structural features in the earth's crust. To investigate these features in large oceanic areas masked by water and sediments, geophysical techniques must be employed. This report of a geomagnetic and bathymetric survey near the southern Bahama Islands helps to clarify the major crustal trends in this structurally complex area. egg ~4 Ag H- He nal ee DENYS W. KNOLL Rear Admiral, U. S. Navy Commander wT KAUN 0 0301 OOb41LSe 3 iii rience WIE, Ill. IV. CONTENTS INTRODUCTION . SURVEY OPERATIONS A. Conduct of Survey B. Instrumentation DATA PROCESSING ....... SURVEY RESULTS AND DESCRIPTION A. South Bahama Area Survey . JA yabacoybhe-y ithatch'a ny Qn G aD SUMMARY OF FINDINGS .... REFERENCES ...... ae Wah eye stay Wels cee fei ped et ere 4 OF FEATURES 0 Goma Guach NON Cac. cota ‘0 5) FIGURES Index Chart South Bahama Area Track Chart South Bahama Area Magnetic Total Intensity Contour Chart South Bahama Area Regional Magnetic Intensity Contour Chart South Bahama Area Residual Magnetic Intensity Contour Chart South Bahama Area Bathymetric Contour Chart Magnetic and Bathymetric Profiles A-B Magnetic and Bathymetric Profiles B-C Magnetic and Bathymetric Profiles C-D and E-F Magnetic and Bathymetric Profiles F-G and J-K Magnetic and Bathymetric Profiles H-I Magnetic and Bathymetric Profiles X-Y Magnetic and Bathymetric Profiles I-J Magnetic and Bathymetric Profiles L-M Magnetic and Bathymetric Profiles M-N Magnetic and Bathymetric Profiles N-O vi 11 13 15 17 19 20 21 22 23 24 ZS) 26 27 28 I. INTRODUCTION A survey of an area northeast of the southern Bahama Islands was conducted by USS SHELDRAKE (AGS-19) between 22 October and 25 November 1962. The purpose of this survey was to obtain geomagnetic and bathy- metric data in an offshore area not previously subjected to systematic surveys. This work was performed as part of U. S. Naval Oceanographic Office joint projects M-15 and H-50. Location of the survey area is shown in figure l. The primary purpose of this report is to present the geomagnetics phase of the survey. Bathymetric data are included for correlation with the geomagnetic data and to aid in geologic interpretation. II. SURVEY OPERATIONS A. Conduct of Survey This survey was conducted in an 18,000 - square-mile area located northeast of the southern Bahama Islands (figure 1, Index Chart). Primary survey lines were run in a northeast-southwest direction perpendicular to the trend of the southern Bahamas. Average track spacing was 5 miles. Five cross-check lines were run to check navigational control and to define more clearly certain bathymetric features (figure 2, Track Chart). The ship's average speed while surveying was 12.5 knots. Magnetic and bathymetric data were collected simultaneously along all survey lines. In the survey area, the ship's position was fixed at 15 minute time intervals using Loran-A. Fix accuracy, as determined by cross- check lines, was within one mile. The most accurate fixes were in the west-central part of the survey area, and the least accurate occurred in the eastern part. Loran-A fixes at 30-minute time intervals were used to plot the tracks to and from the survey area. B. Instrumentation Total magnetic intensity measurements were made with a Varian nuclear resonance magnetometer, model V-4914. To diminish the effect of the ship's magnetic field, the sensor unit was towed approximately 700 feet astern of the ship. Because of equipment design, magnetic ' a unit of measurement data were recorded as ''magnetometer counts,' inversely related to the magnetic field intensity. These units were recorded in analog form on a Sanborn Galvanometric Recorder. 30° 40° UNITED STATES 65° 60° 40° 24 NOV 62 1300 =t0) \ Scr a2 24 NOV 62 ‘0000 22 NOV 62 “0000 17 NOV 62 1000, J ALL TIMES LOCAL FIGURE 8 NOV 62 ‘9000 4 GN x 2000 15 NOV 62 . Vi he ST. CROIX oon 1) GUADELOUPE { ~ 2 70° 65° 3 1.—INDEX CHART Bathymetric data were obtained with a Precision Depth Recorder (MK XI) and an AN/UQN 1-C sonar sounding set using an unstabilized transducer. III. DATA PROCESSING All magnetic data were scaled for absolute values of total intensity in gammas using a specially constructed conversion template. These values for the survey area then were plotted on a 1:500,000-scale track chart. Using this chart, a total magnetic intensity contour chart (figure 3) was constructed with a contour interval of 50 gammas. A regional magnetic intensity contour chart for the Southern Bahama Area is shown in figure 4. Regional magnetic intensity contours were obtained by graphically smoothing the total intensity contours. To amplify the trends and character of the magnetic anomalies, a residual magnetic intensity contour chart was constructed (figure 5). This residual chart was prepared by removing the regional magnetic intensity values from the observed total intensity values. Magnetic data were not corrected for temporal variations of the earth's magnetic field. The cross-check lines run in the survey area indicate that temporal variations were less than the contour interval chosen. San Juan Magnetic Observatory records show that no major magnetic disturbances occurred during the entire survey period. A bathymetric contour chart (figure 6) was constructed at the same scale as the above charts and has a contour interval of 20 fathoms. No sound velocity or other corrections have been made to the bathy- metric data. IV. SURVEY RESULTS AND DESCRIPTION OF FEATURES A. South Bahama Area Survey As a result of this survey, the geomagnetic field and bathymetry of an 18,000-square mile oceanic area near the southern Bahama Islands have been charted in detail. Magnetic total intensity contours and residual magnetic intensity contours are shown in figures 3 and 5 respectively. Bathymetric contours are shown in figure 6. The simul- taneous collection of magnetic and bathymetric data allows direct cor- relation between the magnetic and bathymetric charts of this area. The residual magnetic contour chart (figure 5) shows three sig- nificant magnetic lineations in the survey area. The most pronounced of these magnetic trends is located in the southern part of the area where the anomalies strike N74°W. This direction parallels structural trends in Jamaica, central Cuba, and in the northern part of Hispaniola. These structural trends are believed to have been established in the Jurassic and late Cretaceous periods (Schuchert 1935, pp. 413; 483). The anomalous trend does not have any definite association with bathy- metric features in the survey area. Using empirical slope techniques, depth estimates indicate that the top of the magnetic source of the anomaly lies at a depth of 11 nautical miles below sea level. On the northwestern side of the survey area is a second magnetic trend. This trend, striking N50°W, is parallel to both the strike of the southern Bahama Islands and the bottom features on the northwest and southeast sides of the area (figure 6). The third magnetic trend, evident in the northeastern section of the area, strikes N319E. This trend is a very pronounced series of parallel positive and negative anomalies. The bathymetric contour chart (figure 6) shows a series of small bathymetric features paral- leling the strike of these anomalies. This bathymetric lineation extends from Caicos Passage to a point approximately 80 nautical miles to the northeast. A computer program for polynomial fitting of surfaces by least squares will be used to determine whether the magnetic trend extends to the southeast into Caicos Passage. Esti- mates indicate that the top of the source of these magnetic anomalies is between 3 and 4 nautical miles below sea level. The linearity, extent, and direction of these three magnetic anomalies suggest that this area is the focus of three major faults or fault zones. At least one, in the southern part of the area, appears to occur in the basement. An interesting magnetic anomaly is found in the extreme eastern corner of the survey area. This anomaly (shown in figure 3) has steep gradients and high amplitudes, but no bathymetric feature is associ- ated with the anomaly. Depth estimates using empirical methods indi- cate a depth of approximately 5 nautical miles to the top of the source of the anomaly. This depth is about 2 miles below the present ocean floor. B. Enroute Survey An additional 2350 nautical miles of geomagnetic and bathymetric data were collected concurrently while proceeding along tracks to and from the survey area. This information is presented in profile form in figures 7 through 16. Profile locations are shown in figure l. Profile A-B (figure 7) shows the characteristic continental slope anomaly found off the east coast of the United States (U. S. Naval Oceanographic Office Technical Report 133, pp. 11 through 23). Pro- files B-C and C-D (figures 8 and 9) show no distinctive features other than the normal geomagnetic gradient. Profiles F-G and I-J (figures 10 and 13) were made while crossing over the Puerto Rico Trench. Profile F-G is relatively smooth over the trench, but profile I-J shows what appears to be a small, positive anomaly in the trench area. Profile H-I (figure 11) extends from the island of Saint Croix across the Virgin Islands platform. This profile shows very high amplitude magnetic anomalies on both sides of the platform. The anomaly on the southern side is attributed to a fault of late Cenozoic origin described by Schuchert (1935, p. 474). The anomaly on the northern side is believed to be related to a fault described by Butterlin (1956, p. 373). There are many short-wave-length anomalies with steep gradients on the platform itself (figure 12, profile X-Y). These are attributed to the presence of basic igneous material a short distance below the present ocean floor. Profile J-K (figure 10) shows a broad magnetic anomaly located just east of the survey area. There is no evident bathymetric feature associated with this anomaly. Except for several small magnetic anomalies associated with small bathymetric features in the southernmost part, profiles L-M, M-N, and N-O (figures 14, 15, and 16) show no distinctive anomalies. V. SUMMARY OF FINDINGS Three diverse geomagnetic trends are exhibited in this detailed geomagnetic survey off the southern Bahama Islands. One of these extensive lineations, striking N74°W, agrees with some of the structural trends of the Antilles. Perhaps because of the depth of burial of its source, the anomaly shows no definite correlation with the bathymetry in the survey area. The N50°W strike of a second magnetic trend is reflected in the lineations of bathymetric features in the survey area, and also by the trend of the Southern Bahamas Islands. The third trend is formed by a series of parallel, linear magnetic features striking N31°E, This trend is paralleled by a linear arrange- ment of bathymetric features in the center of the survey area. These three magnetic lineations may indicate that this area is the focus of three major fault zones. MERCATOR PROJECTION SCALE 1:1,500,000 CROOKED ISLAND. p= A S07 ; 7 ESA Va y vA Le, i} KO LF ttl TURKS sure a Fa ALL TIMES LOCAL FIGURE 2.—SOUTH BAHAMA AREA TRACK CHART 9 TAL —— a ‘i { fray ‘ew. 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Ne oz Aine Noize 22 ™ +00. 2S DEPTH IN FATHOMS TOTAL MAGNETIC INTENSITY IN GAMMAS I-H SATIAONd DINLANAHLVE AGNV DILANSVN 0002 0051 JOvssSVd VOVDINV 0001 00s 13431 vas ~ = 000eF OSZEP O0SEF OSLEb 000b¢ 01 °SOoM me Si Nsp zy Nee. 2) Soy “Ely Gs = [Bye | 02 SL} Elz zo RONG! Sey 50/5, N.Ooly eA S31IW 1VDILNVYN [1048 404 A-X S8/14O1g 4ewkyjog puo riyauBow — “Z| aunBiy 228g “LL AYNSIA 13A31 VAS 0002 00SL 0001 00S 91Dq ON a}0>!pu) seul] paysog ° 00Lo 0008 OSzEP 00SEF OSLEb 000by 0020 9 AON YL DEPTH IN FATHOMS TOTAL MAGNETIC INTENSITY IN GAMMAS 23 DEPTH IN FEET TOTAL MAGNETIC INTENSITY IN GAMMAS 002 00L 000E¢ 00ZEr O0vEr 009ey O08Er 000br A-X SAMIAOYNd DIYLANAHLVE GNV DILANOVN ~ “2l Sandia S3IW 1VDILAYN (uo10907 4904) 404 | | asnBiy aac) 002 00L Q00Er O0ZEY O0bEr O09Eb 008Er 000r% z9 AON 91 DEPTH IN FEET TOTAL MAGNETIC INTENSITY IN GAMMAS DEPTH IN FATHOMS TOTAL MAGNETIC INTENSITY IN GAMMAS 00z0* ~_ Z9 AON 91 fl SAMAOCYNd DIMLAWAHLVE GNV DILANDVW ‘el 3YNOIS HINIYL ODIY OLYINd 13431 vas ByDg ON afod/puy seul] paysog z9 A ON ZL DEPTH IN FATHOMS : < 1) Zz > = 7) Z & “ Zz ) i Z 3 B < ie) 25 0008 DEPTH IN FATHOMS TOTAL MAGNETIC INTENSITY IN GAMMAS W-71 SAMA0OUd DIVLANAHLVGE GNV SDILANSVAW ‘vi S3YNSI4 13A31 VAS DEPTH IN FATHOMS TOTAL MAGNETIC INTENSITY IN GAMMAS 0058 00067 0056 0050S O0SLS 26 ML DEPTH IN FATHOMS TOTAL MAGNETIC INTENSITY IN GAMMAS N.6% N-W S31ISd0O'"d DIYLANAHLVE OGNV DILANOVW ~ ‘SI Senda 000€ 0002 0002 0001 0001 13A31 VIS JOG ON aj02!pu; saul] paysog 00s1s 00515 0002s 000zs 00szs 00szs 000€s 000€s 00S€s 00ses 000¢S 0006S Nove 0012 —~_ 79 AON 22 0000 So %9 AON £% 000 — > —— |" —— - o00ez z9 AON €% N.O€ NoLE N.ZE No€€ N.E DEPTH IN FATHOMS TOTAL MAGNETIC INTENSITY IN GAMMAS 27 O-'N SATIAOUd DIYLANAHLVGE GNV SDILANOVW— ‘91 3YNDIA DEPTH IN FATHOMS DEPTH IN FATHOMS TOTAL MAGNETIC INTENSITY IN GAMMAS : ft) z is 7) 74, # Zz Y G Z : < x 2 o0ez Z9 AON €2% . 0089 (4noH 8UO 5990/D pepsojey) 28 REFERENCES Butterlin, J., La Constitution Geologique et La Structure Des Antilles, Centre National De La Recherche Scientifique. 1956. U. S. Naval Oceanographic Office, A Marine Magnetic Survey Off the East Coast of the United States, Technical Report 133, Project N-20, Sept. 1962. Schuchert, C., Historical Geology of the Antillean - Caribbean Region, John Wiley and Sons, 1935. 29 ae is r “ o € ne i med, , a} i 1 ty Vip ee ae i a i ok Saal ink be Be “4 gs As j . yh eee N H e = : OE CU ge ribet Nek mi Ay LAR aS ai See Rhecge 4 i] i A “i qu . 1 q ( i t ; , , hs | ; GI-W 20eforg O9T-aL Areay *y STIQ pue Avoeig *y Aemeq :sioyjny GT-W Joelorg--seueyeg Ureyynog euy, 330 AeAANS DTJouseR_ SUTACW :OTITL ws}fjzou -Sey--spue,Tsy eweyeg seueyeg utey Nog --[eFAqseiiey ‘usTjousey ST-W qeforg O9T-aL Azaay “gy St30 pue Aeoeig *y Aemoq :sitoyqny CT-W J00loOrg--semeyeg Urey Nos eq], JJQ AcAaNG DPJouseW SUTILW :eTITL usfqoeu -3ey--Spuel[sy eumeyeg seueyeg uleyzNog --[eFAIseliey ‘usp zousey “AT “TF “AT “FFF *souoz 4[ney Zo sj[ney aofew vey, Jo snoojz 9yQ S]T Bole 94] Jey. eeoTpuT Aew YOTYM SUOT}BSUTT OFJouseW VsATROUTISTP ee14} peTeeAet sey seueyeg UTSYyINOs ey} Jyo AvAINS dTJoauseuUo0ss y (O9T-UL) “SeaIn3zzZ gT SutpnTouT “d 6z *¢€96T Aine SAt04y *g STIO pue Asoeig *y Aameg 4q ‘*CT-W LOFLOUd--SVAVHVE NYFHLOOS FHL HAO ADAUNS OLLANDVW ANIYWW 2OTIJO WYderzSouess9 TeAeN °S'n *souoz J[Ney io s3[nejz tofew sei1y3 Jo snooz ayQ S] Bele 34} Jey ojReOTpuy Aem Yo TY SUOTJeSUTT OFJouseW VATIOUTISTP 2014} peTeeAer sey seweyeg u19q Nos 243 FFO ABAINS DTJouseuoss y (O9T-UL) “Sean3szy g]T SufpnpouT “d 62 “e961 Aine ‘Ateay “| STIO pue Asorig *y Someg Aq ‘*CT-wW LOACOUd--SVNVHVd NUFHLOOS FHL 440 ATAMNS OLLANOVW ANIYVW 297350 VTYderSouBs[Q [eAeN *S'n GI-W eforg O9T-UL AdaAy °y STIO pue Aevoeig *y Aemeq :sioyqny GI-W Joel org--seumeqeg Wieyqqnog ey] JJQ AeAINg DyJoOuse_ oUPAeH + OTITL wsfjou -3ey--spueTsy eueyeg seueyeg ureyqNog --[eTIJseitey, ‘ust zousey GT-W 200f01g O9T-UL AxeAy “| STIO pue Avorig *y Aemaq :sioyqny CI-W Joolorg--seueyeg Urey gnos s4y, JJQ AeAANS DPqJouseW SUTIeW :OTIFL wsTqou -Sey--Spue[sy eweyeg seuryeg uroy nog --JeTiqseliey ‘usTjoeusey AT “TEE °AT “FFF *souoz [ney Zo s3z[ney tofew very Fo snosoz 943 S} Pete 94} Jey e}eoTpuyT Aew yoTyM SUOT}BOUTT IFJousew sATIOUTIASTP 2e14} peTBeAet sey seweyeg uteyjnos 243 Fyo AvAAINS DTJouseuo0es y (O9IT-UL) “SeaInSTT 9] Suppnypour “d 6z *°€96T Aine SAa0ay “gq STIO pue Asoeig *y Aomeg Aq *C{[-K LOaLOUd-~SVNVHVE NYAHLNOS FHI. 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