J. Escuder-Viruete et al. Correspondence to: J. Escuder-Viruete
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1 Supplement of Solid Earth, 7, 11 36, doi: /se supplement Author(s) CC Attribution 3.0 License. Supplement of The Imbert Formation of northern Hispaniola: a tectono-sedimentary record of arc continent collision and ophiolite emplacement in the northern Caribbean subduction accretionary prism J. Escuder-Viruete et al. Correspondence to: J. Escuder-Viruete (j.escuder@igme.es) The copyright of individual parts of the supplement might differ from the CC-BY 3.0 licence.
2 Description of facies associations in the Imbert Formation Code Dominant facies types Features (grain size, grading/fabric/clast orientation) Flow type Interpretation of depositional environment Os Lensoidal serpentinite blocks in a heterogeneous and mostly deformed matrix composed of shale, mudstone and sandstone Blocks randomly distributed in a polymictic brecciated matrix. Blocks of mainy peridotite/serpentinite nature (exotic) but also intra-basinal (not-exotic). Block of few centimeters to several meters in size (rarely tens of meters). Blocks and clasts are angular and of similar nature than in Gm (RSJC). Abundant serpentinite particles of sand size. Structureless silts and muds. Gravity-driven mass-transport Slope facies to foreland facies. Mass transport processes (debris flows, debris deposits at the wedge front avalanches, slumps, block slides, etc.) and hyperconcentrated flows. Bands of normal brittle shearing Gm Massive breccia and matrix-supported, muddysandy (polymictic) conglomerate Desorganized internal structure, pebble to cobble size, ungraded, Non-cohesive debris flow often erosive base, random clast orientation. Clasts of (mainly) serpentinite, red/green volcanic rocks, laminated sandstone, feldspar grains, (rare) white limestone and red and green mundstones (rip-up clasts). In the RSJC clasts of ferruginized volcanic rocks, red microbreccia, porphyritic lavas, isotropic gabbros and dolerites also occur. Often lenticular beds with erosive base, deformed by synsedimentary extensional faulting Larger channel deposits within submarine fan systems, relatively stable in position, probably served as major sediment conduits to basin. Slumping processes Gp Clast-supported, sandy (polymictic) breccia and conglomerate Inverse-to-normally graded internal structure, clast-supported fabric, angular clasts of sand to pebble grain-size, random clast orientation. Massive internal structura also occur. Often lenticular beds with erosive base, deformed by syn-sedimentary extensional faulting. Interbedded pebby conglomerate and coarse-grained sandstone Non-cohesive debris flow Channel deposits within submarine fans, transitional to cohesive possibly less stable in position than Gm. Rare debris flows?, postdepositional associated overbank/levee deposits. Slumping fluidization effects processes Sc Medium-to-thick bedded coarse-grained sandstone and microconglomerates Parallel-stratified sandstones. Organized internal structure (Boumasequences Ta or Tb) or massive. Sand (coarse-to-granule) grain size. Internal normally graded. Often horizontal-lamination, rare argillite pebbles at base. Intercalations of Gn facies conglomerates and microconglomerates High-concentration turbidity currents. Post-depositional liquefaction Undifferentiated lobe or channel fill facies. Slumping Sm Thin-bedded, medium-tofine-grained sandstone Parallel-stratified sandstones. Organized internal structure (Boumasequences Tb or Tc) or massive. Silt-sand grain size. Sandstone/mudstone ratios of 40-75% sandstone Turbidity currents More proximal lobe-fringe or levee/overbank facies. Slumping Sf Fine-grained sandstone, siltstone and laminated mudstone Alternating fine-grained sandstone-mudstone sequence. Sand-mud couplets and muddy sands, 20-80% sand grade, <80% mud grade. Often organized internal structures. Silt-sand grain size. Gradedstratified silt. Thin regular silt and mud laminae. Turbidity currents Distal lobe facies. Slumping in upper stratigraphic levels Ms (RSJC) Massive variocolored mundstone-mundslate with clasts and blocks (of Gm) >80% mud, <30% silt, 0-20% sand of serpentinitic composition. Disorganized internal structures. Caotically disposed <60% cobble to boulder angular to subrounded blocks of serpentinite, beig sandstone, green mundstone. Structureless or banded red, green and grey muds Tv Fine-grained tuff with alternating fine-grained tuffaceous sandstonemudstone White, cream and turquoise coloured tuff. Rare laminated internal structure in tuff. Fine-grained size in sands. Structureless silts and muds. Alternating thin-bedded, fine-grained tuffaceous sandstonemudstone sequence Dilute turbidity currents and volcanic particle fall Very distal lobe and basin plain facies. Lc (RSJC) White coarse-grained calcarenites White shelfal-derived calcarenites and bio-calcarenites (intrabasinal) and green serpentinite clasts (extra-basinal elements). Medium to coarse-grained size Turbidity currents
3 Bulk rock major and trace element compositions of studied samples from the Imbert Fm X -70,812-70,812-70,809-70,829-70,812-70,812-70,812 Y 19,758 19,758 19,753 19,778 19,758 19,758 19,758 Rock dyke dyke sill sill basalt basalt dolerite Sample 10JE222 10JE222B11JE15 13JE27 13JE30A 13JE30B 13JE30C SiO2 52,91 52,87 51,48 49,19 52,05 52,16 43,54 TiO2 1,17 1,17 1,26 0,68 1,24 1,22 0,43 Al2O3 15,43 15,55 16,24 14,77 15,50 15,31 9,85 Fe2O3 11,27 11,17 11,23 8,70 11,55 11,61 4,20 MgO 3,22 3,22 3,67 6,63 3,19 3,09 1,59 CaO 6,48 6,46 8,74 6,81 6,36 6,32 19,31 Na2O 3,43 3,48 3,18 2,32 3,45 3,39 1,77 K2O 1,49 1,49 1,10 0,87 1,29 1,32 1,62 P2O5 0,22 0,22 0,18 0,12 0,22 0,22 0,11 MnO 0,20 0,20 0,18 0,13 0,20 0,18 0,36 Cr2O3 0,00 0,00 0,00 0,02 0,00 0,00 0,03 LOI 3,90 3,90 2,50 9,60 4,70 5,00 17,00 SUM 99,77 99,77 99,78 99,84 99,77 99,77 99,84 Mg# a Cr 3,4 6,8 6,8 116,3 6,8 6,8 225,8 Co 26,20 26,50 27,10 24,60 26,20 24,90 11,70 Ni 5,40 5,80 69,30 5,20 4,90 66,10 V Rb 19,00 18,80 16,60 10,00 13,30 12,30 16,90 Ba Th 2,10 2,20 1,50 1,00 1,80 1,60 1,00 U 0,90 0,90 0,80 0,40 0,70 1,00 0,40 Nb 2,50 2,40 1,70 2,50 2,30 2,30 2,00 Ta 0,40 0,20 0,17 0,21 0,19 0,19 0,17 La 10,40 10,80 8,80 6,70 10,60 11,50 6,50 Ce 27,10 27,20 21,60 14,00 25,30 24,80 11,30 Pb 5,30 4,60 28,70 11,70 3,90 2,70 2,20 Pr 4,12 4,14 3,42 1,91 3,81 3,92 1,70 Sr 253,6 256,6 286,8 192,3 280,1 268,9 362,9 Nd 19,80 20,10 16,80 8,10 19,00 18,90 7,80 Sm 5,25 5,58 4,50 2,08 5,01 4,95 1,86 Zr 148,5 150,1 129,3 58,8 141,9 135,0 61,1 Hf 4,50 4,50 3,60 1,60 4,10 4,10 1,50 Eu 1,43 1,47 1,33 0,68 1,43 1,34 0,59 Gd 5,52 5,63 4,69 2,37 5,39 5,77 2,10 Tb 0,98 1,01 0,76 0,42 0,92 0,97 0,35 Dy 6,12 5,97 4,75 2,42 5,28 5,49 2,07 Y 34,2 33,8 28,5 14,0 31,3 29,9 11,7 Ho 1,25 1,30 0,98 0,55 1,15 1,20 0,43 Er 3,71 3,75 2,97 1,75 3,34 3,38 1,31 Tm 0,58 0,58 0,47 0,25 0,51 0,53 0,21 Yb 3,68 3,67 2,93 1,71 3,39 3,27 1,32 Lu 0,56 0,56 0,45 0,23 0,52 0,49 0,21 Major elements in wt.%; trace elements in ppm. a Mg# = 100 * mol MgO/ mol (FeO + MgO); for Fe2O3/FeO = 0.2. Total Fe as Fe2O3.
4 Results of the paleostress analysis in the Imbert Formation Outcrop a Lithology Numbe 1 b Eigenvalue 2 Eigenvalue 3 Eigenvalue R 11JE11 IM2 unit, PPC 36 14,1;12,5 0, ,1;73,2 0, ,6;11,1 0,019 0,94 11JE15 IM2 unit, PPC ,9;72,4 0, ,8;15,1 0, ,4; 08,9 0,050 0,69 10JE224 IM2 unit, PPC 22 20,5; 08,5 0, ,5; 81,4 0, ,3; 01,3 0,087 0,54 10JE224B IM2 unit, PPC 12 98,1; 70,7 0, ,3; 08,9 0, ,6; 16,9 0,007 0,98 10JE225 IM2 unit, PPC ,4; 76,7 0, ,9;02,2 0, ,5;13,1 0,043 0,81 10JE225B IM2 unit, PPC ,5; 67,9 0, ,9; 02,6 0, ,0;21,9 0,036 0,89 11JE51 IM3 unit, RSJC ,4;82,1 0, ,8;8,6 0, ;14,8 0,094 0,88 10JE252 IM3 unit, RSJC 32 73,4; 34,9 0, ,4; 48,5 0, ,1; 19,6 0,107 0,55 10JE252B IM3 unit, RSJC 12 29,8; 82,4 0, ,3;07,1 0, ,0;02,8 0,102 0,53 a All data rotated by unfold the average bedding plane b The values of sigma correspond to two angles (in degrees), the first one being the trend of stress axis and the second one being its plunge. Trends and plunges of axes of paleostress tensors deduced from the inversion of orientation and striae of faults using FaultKin software (Marret and Almendinger, 1990) R, axial ratio, ( 2-3)/( 1-3)
5 Summary of 40 Ar- 39 Ar incremental heating experiments of mineral separates 10JE54 Plagioclase (sample/mineral) Laser Isotope Ratios Power(%) 40Ar/39Ar 2s 36Ar/40Ar 2s r.i. Ca/K %40Ar atm f 39Ar 40Ar*/39A Age 2s 2,3 125,508 4,635 0,331 0,015 0,013 0,802 91,033 6,296 11,257 57,529 33,025 3,2 29,374 0,543 0,065 0,003 0,093 8,360 74,259 32,249 7,585 38,965 9,131 3,5 18,838 0,400 0,027 0,002 0,105 3,374 49,093 17,636 9,602 49,185 7,508 3,9 19,268 0,165 0,033 0,002 0,054 2,489 58,027 10,302 8,095 41,554 6,719 4,5 23,247 0,427 0,046 0,003 0,025 2,643 68,229 13,626 7,393 37,988 8,756 5,5 24,884 0,481 0,046 0,002 0,067 4,822 63,239 11,807 9,165 46,973 5, ,154 0,753 0,047 0,003 0,037 7,312 65,324 8,083 8,399 43,096 11,428 J = ± Volume 39A0, x E-13 cm3 NPT Integrated Date = 44, , Ma Plateau age = 44.0 ± 3.1 Ma (2s, including J-error of MSWD = 1.2, probability=0.28 Includes 100% of the 39Asteps 1 through 7 Inverse isochron (correlation age) results, plateau steps: Model 1 Solution (±95%-conf.) on 7 points Age = 42.8 ± 5.3 Ma Initial 40Ar/36Ar =350 ± 20 MSWD = 1.5 Probability = 0.15 JM9112 Plagioclase (sample/mineral) Laser Isotope Ratios Power(%) 40Ar/39Ar 37Ar/39Ar 36Ar/39Ar Ca/K %40Ar atm f 39Ar 40Ar*/39ArK Age 2 2,00 W 621,48 32,76 46,61 2,96 2,114 0,124 88,26 99,92 0,16 0,519 5,20 ± 357,01 2,20 W 114,42 1,91 14,70 0,38 0,391 0,011 27,20 99,92 4,27 0,093 0,94 ± 52,71 2,40 W 98,52 1,04 18,69 0,36 0,329 0,008 34,70 97,03 7,86 2,964 29,51 ± 43,73 2,70 W 71,43 0,70 79,08 1,44 0,247 0, ,39 93,09 13,55 5,225 51,71 ± 32,66 3,00 W 21,64 0,25 77,74 1,43 0,083 0, ,65 83,76 7,06 3,720 36,96 ± 15,25 3,40 W 15,34 0,21 36,62 0,75 0,052 0,002 68,86 80,82 8,06 3,022 30,08 ± 12,10 4,00 W 9,75 0,08 14,80 0,26 0,028 0,001 27,39 71,15 38,66 2,841 28,30 ± 5,00 4,80 W 23,44 0,27 43,13 0,81 0,077 0,002 81,47 81,46 11,40 4,482 44,45 ± 11,82 5,80 W 24,38 0,20 51,25 0,92 0,077 0,002 97,39 76,43 5,23 5,962 58,89 ± 11,28 6,80 W 32,21 0,34 64,29 1,21 0,109 0, ,34 84,01 3,76 5,394 53,36 ± 21,18 J = ± Volume 39ArK 0,095 Integrated Dat 35,54 ± 6,76 Ma Plateau Age = 29.5 ± 4.3 Ma (2s, including J-error of.3%mswd = 0.71, probability= % of the 39Ar, steps 1 through 7 Inverse isochron (correlation age) results, plateau steps: Model 1 Solution (±95%-conf.) on 10 poi Age = 34 ± 13 Ma 40/36 intercept: 300 ± 18, MSWD = 3.8, Probability = (at J= ±.3% 2s) HH9124 Hornblende Laser Isotope Ratios (sample/mineral)
6 Power(%) 40Ar/39Ar 37Ar/39Ar 36Ar/39Ar Ca/K %40Ar atm f 39Ar 40Ar*/39ArK Age 2 2,00 W 5886, ,78 281,78 165,84 19,940 11, ,24 99,50 0,03 37, ,97 ± 3459,40 2,80 W 526,06 25,45 13,28 0,68 1,810 0,096 24,55 99,66 3,19 1,787 17,83 ± 243,56 3,30 W 258,22 16,39 61,53 4,17 0,887 0, ,81 98,16 2,06 4,973 49,21 ± 200,04 4,00 W 87,11 1,78 14,67 0,50 0,290 0,014 27,14 96,16 3,46 3,379 33,58 ± 73,07 5,00 W 25,46 0,32 1,69 0,04 0,068 0,002 3,10 78,12 35,96 5,576 55,09 ± 11,65 6,00 W 19,57 0,28 3,67 0,09 0,048 0,002 6,73 71,61 25,23 5,571 55,04 ± 11,08 7,00 W 21,67 0,35 4,44 0,13 0,044 0,002 8,16 58,63 30,06 8,994 88,05 ± 8,74 J = ± Volume 39ArK 0,018 Integrated Dat 63,11837 ± 10,70 Ma Plateau Age = 55 ± 8 Ma (2s, including J-error of.3%mswd = 0.093, probability= % of the 39Ar, steps 1 through 6 Inverse isochron (correlation age) results, plateau steps: Model 1 Solution (±95%-conf.) on 6 poin Age = 55.5 ± 9.6 Ma 40/36 intercept: ± 9.2 MSWD = 0.09, Probability = 0 (at J= ±.3% 2s)
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