####################### Meta Data Part ############################# Column Name Data Type Description Label Validation Text Unit 1 EXPEDITION Numeric expedition code # "expedition code (Int. 1 - 99999), required key field <>0" # 2 SITE Numeric "site, number between 1 and 9999" Site "site (1 -9999), required key field <>0" # 3 HOLE text "hole identifier, A-Z" Hole "hole (A-Z), required key field LIKE ('[A-Z]')" # 4 CORE Numeric core identifier Core "core identifier, required field, a number between 1 and 99999 between 1 and 99999" # 5 SECTION Numeric section number Section section number > = 0 >=0 # 6 SECTION_UNIT Integer currrent section-unit Lithology # # # 7 TOP_INTERVAL Double distance from top of section-unit to top of section Distance To Top Of Section real value >=0.0 >=0.0 cm 8 TOP_DEPTH Double calculated top depth of section-unit Calculated Top Depth (mbsf) real value >=0.0 >=0.0 mbsf 9 TOP_DEPTH_MCD Double calculated top depth of section-unit Calculated Top Depth (mcd) real value >=0.0 >=0.0 mcd 10 UNIT_CLASS Text lithological class of section-unit Unit Class text string of maximum 30 characters # # 11 UNIT_TYPE Text lithological type of section-unit Unit Type text string of maximum 80 characters # # 12 UNIT_DESC Memo rock name of current section-unit Unit Description unlimited text string # # 13 REMARKS Memo general comments to current section-unit General Comments unlimited text string # # 14 MAJOR_LITH Text major lithology Major Lithology text string of maximum 80 characters # # 15 MAJOR_LITH_P Double estimated percentage of major lithology Percentage Of Major Lithology integer value 0-100 between 0 and 100 # 16 CONTACT_TOP Text top contact type of the current section-unit Top Contact text string of maximum 30 characters # # 17 CONTACT_BOTTOM Text bottom contact type of the current section-unit Bottom Contact text string of maximum 30 characters # # 18 SECTION_ID Numeric "section identifier," Section "section Identifier,required field <>0" # 19 BOTTOM_INTERVAL Double distance from top of section-unit to top of section Bottom To Top Of Section # # cm 20 ROCK_TYPE Text sandstone petrology petrology text string of maximum 30 characters # # 21 STRENGTH Text strength of major lithology Fractures text string of maximum 30 characters # # 22 ANALYST2 Text initials of data operator Geologist2 required text string of max. 5 characters <>'' # 23 ANALYST1 Text initials of data operator Geologist1 required text string of max. 5 characters <>'' # 24 ALTERATION Double grade of alteration Alteration real values # # 25 CALCITE Double CALCITE calcite real values # # 26 PYRITE Double PYRITE pyrite real values # # 27 OXIDATION Double OXIDATION oxidation real values # # 28 VEIN_FILLINGS Double VEIN_FILLINGS vein filling real values # # 29 CHALCEDONY Double CHALCEDONY chalcedony real values # # 30 QUARTZ Double QUARTZ quartz real values # # 31 CLAYMIN Double CLAY clay real values # # 32 PREHNITE Double PREHNITE prehnite real values # # 33 EPIDOTE Double EPIDOTE epidote real values # # 34 WOLLASTONITE Double WOLLASTONITE wollastonite real values # # 35 AMPHIBOLE Double AMPHIBOLE amphibole real values # # 36 GARNET Double GARNET garnet real values # # 37 ANHYDRITE Double ANHYDRITE anhydrite real values # # 38 HEMATITE Double HEMATITE hematite real values # # 39 MAGNETITE Double MAGNETITE magnetite real values # # 40 CHALCOPYRITE Double CHALCOPYRITE chalcopyrite real values # # 41 SPHALERITE Double SPHALERITE shalerite real values # # 42 GALENA Double GALENA galena real values # # 43 ALBITE Double ALBITE albite real values # # 44 CLINOPYROXENE Double CLINOPYROXENE clinopyroxene real values # # 45 SPHENE Double SPHENE sphene real values # # 46 ARAGONITE Double ARAGONITE aragonite real values # # 47 INTRUSION Text intrusion intrusion text string of max. 80 characters # # 48 REMARKS1 Memo # Fracture-Veins Comments unlimited text string # # 49 REMARKS2 Memo # General Comments # # # ####################### Data Part ############################# EXPEDITION SITE HOLE CORE SECTION SECTION_UNIT TOP_INTERVAL TOP_DEPTH TOP_DEPTH_MCD UNIT_CLASS UNIT_TYPE UNIT_DESC REMARKS MAJOR_LITH MAJOR_LITH_P CONTACT_TOP CONTACT_BOTTOM SECTION_ID BOTTOM_INTERVAL ROCK_TYPE STRENGTH ANALYST2 ANALYST1 ALTERATION CALCITE PYRITE OXIDATION VEIN_FILLINGS CHALCEDONY QUARTZ CLAYMIN PREHNITE EPIDOTE WOLLASTONITE AMPHIBOLE GARNET ANHYDRITE HEMATITE MAGNETITE CHALCOPYRITE SPHALERITE GALENA ALBITE CLINOPYROXENE SPHENE ARAGONITE INTRUSION REMARKS1 REMARKS2 5029 4 B 3 1 1 0 3648 3648 VOL Fine grained basalt NN NN 0 3101870 RZ 3 -999.25 1 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 2 -999.25 1 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 1 -999.25 -999.25 -999.25 intrusion "There are several sets of discontinuous, somewhat anastomosing veins that dip in multiple directions with dips generally ranging from 40° to 75° relative to the core axis. Most veins are 1-2 mm wide, with the largest up to 4 mm. Some veins show clear cross cutting relationships while others veins may curve and merge together into composite veins. All of the veins show the same mineral assemblage, which is dominated by epidote and calcic plagioclase in the vein centers with dark diffuse chloritic selvages. An individual vein may pass from epidote filled to plagioclase filled along its trace. Some very fine-grained quartz may be intergrown with calcic plagioclase locally, but it is a very minor phase at best. Veins often swell or pinch out into dark chloritic alteration that continues along the vein trajectory. Minor sheering and brecciation is observed in the vein fills, but evidence for crystal growth into open space is lacking. Pyrite is the dominant sulfide in the veins and amphibole is seen locally. A few chalcopyrite > pyrrhotite > pyrite discontinuous veins are present at 3648.1 m associated with patchy chlorite and epidote alteration. The veins are irregular and discontinuous, therefore it is difficult to define the vein geometry, but are general three prominent directions of veining. Earliest set is almost perpendicular to the chilled margin, dipping approximately 40° to the core axis, and generally about 1 mm wide. The most prominent vein set is dipping about 50° in the opposite direction, nearly subparallel to the chilled margin and intersects the first set at approximately right angles. The largest vein is up to 3-4 mm wide, but irregular. The largest veins dip at ~ 30° to the core axis and show multiple generations of vein opening and some sheering along the vein." "Unit 1: Sheeted diabase dikes 3648.00 to 3648.52 m. Relatively unaltered grey diabase with felted interlocking lath shaped plagioclase 1-2 mm in length, with interstitial 1 mm subhedral brown pyroxene and minor 0.5 mm euhedral titanomagnetite. There are a few discontinuous veins <1.5 mm across filled with epidote and calcic plagioclase, which vary in proportion along the vein trace. There is a small gap between the uppermost core piece (3648.00-3648.09 m) and the underlying continuous core (3648.09-3648.52 m). A dark, fine-grained chloritic zone ~2 cm wide at 3648.14 truncates the diabasic fabric and is interpreted as the altered chilled margin of the underlying dike. The fabric of this dark zone suggest some minor deformation followed by recrystallization which makes the angle of the contact somewhat indistinct, but it is approximately 50° relative to the core axis. Down core from the chilled margin is a transition from fine-grained basalt into a diabasic textured rock with ~2 mm plagioclase and interstitial pyroxene. The plagioclase appears relatively fresh, but much of the pyroxene has a greenish tinge suggestive of partial uralitization. The deeper dike appears slightly greenish, and more pervasively altered compared to the overly dike, despite the apparent age relationship inferred from the chilled margin, which requires it to be younger. This lower unit is also more heavily veined. Coarsest grain-size is near bottom of the cored interval at 3648.50 m, where there is another black chilled margin chilled against the interior of this half dike. The bottom 3 cm of the middle dike (3648.47-3648.50) show some minor sheering along margin resulting in dark chloritized rock with patches of less recrystallized rock, resulting in a diffuse brecciated texture near the chill." 5029 4 B 5 1 1 111 "3,866.61" "3,866.61" VOL Fine-to medium-grained crystalline Basalt NN NN 0 3101872 RZ 3 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 1 -999.25 1 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 intrusion "Most of the fractures between the core pieces formed during or after coring and there are relatively few mineralized fractures. The fractures typically range from perpendicular to the core axis to approximately 30° and suggest stress relief from vertical unloading during or following coring. There are a few <1mm hairline veins of dark amphibole, which cut the core at various angles, with large changes in vein direction along a single vein. Discontinuous, diffuse replacement veins 1-3 mm wide with lighter colored minerals (likely clinozoestite/epidote with calcic plagioclase) are less common." "Core run 5 recovered 3.85 m of continuous core, with no missing interval. The recovered core is relatively homogeneous dark greenish grey basaltic intrusion. It is composed of subequal amounts of euhedral clear blocky to slightly elongate plagioclase 3-5 mm with interstitial brownish green subhedral to euhedral pyroxene 2-3 mm. Approximately 5-8 % euhedral 2 mm titanomagnetite. Incipient, but pervasive, alteration of pyroxene to dark green amphibole; plagioclase and titanomagnetite are essentially unaltered. Most of the fractures between the core pieces formed during or after coring and there are relatively few mineralized fractures. The fractures typically range from perpendicular to the core axis to approximately 30° and suggest stress relief from vertical unloading during or following coring. There are a few <1mm hairline veins of dark amphibole, which cut the core at various angles, with large changes in vein direction along a single vein. Discontinuous, diffuse replacement veins 1-3 mm wide with lighter colored minerals (likely clinozoestite/epidote with calcic plagioclase) are less common. Overall, the rock appears relatively tight and impermeable despite the fact that partial uralitization of the pyroxenes is pervasive. There are some relatively large pieces of fill about the core, which includes a range of lithologies. Some of the fragments are pervasively altered with abundant veins of epidote, calcic plagioclase, amphibole, quartz, pyrrhotite and chalcopyrite. There are no significant changes in either grain size or modal mineralogy down core that are quantifiable with a hand lens. There are areas appearing to be more felsic which are patchy zones with enhanced alteration of the feldspars. Cloudy alteration of the plagioclase is responsible for the lighter colored patches in the core. This alteration is diffuse and replacive and not associated with through going fractures, although it sometimes occurs in planar, vein-like, zones oblique to the core axis. There are only few, 1 mm-thick, black, hairline veins, mineralized with chlorite-hornblende, cutting the core at both steep and shallow angles. The core has very low porosity and low permeability, yet is pervasively altered. Based on our more detailed logging, we interpret this unit as a dike, or possibly a rather homogeneous sill, but intrusive contacts were not recovered." 5029 4 B 5 2 1 131 "3,867.92" "3,867.92" VOL Fine-to medium-grained crystalline Basalt NN NN 0 3101874 RZ 3 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 1 -999.25 1 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 intrusion Same as the first section. Same as the first section. 5029 4 B 5 3 1 143 "3,869.35" "3,869.35" VOL Fine-to medium-grained crystalline Basalt NN NN 0 3101876 RZ 3 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 1 -999.25 1 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 intrusion Same as the first section. Same as the first section. 5029 4 B 6 1 1 15 "3,869.95" "3,869.95" VOL Fine-to medium-grained crystalline Basalt NN NN 0 3101878 RZ 2 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 intrusion There are only two irregular 1 mm dark veins of chlorite-hornblende which cut the core at an average (but varying) dip of ~ 70° to the core axis. "Core run #6 recovered 15 cm of rock that is nearly identical to what is seen in core 5 and we interpret this as the same dike rock. There are only two irregular 1 mm dark veins of chlorite-hornblende which cut the core at an average (but varying) dip of ~ 70° to the core axis. There was considerable fill recovered on the top of the cored material. Some of it consists of drilling rounded cobbles of volcanic rock variably altered and veined by epidote, similar to what has been recovered as fill in all the previous runs. We interpret this as material that fell into the hole from the lost circulation zones encountered just below the bottom of the casing. Many of the fill fragments are angular slabs of dike rock similar to the cored material. It is notable that several of the largest, flatter fragments show closely spaced planer fractures that are not coated by alteration minerals. Some surfaces show slickenside lines on the fracture planes that indicate relatively recent tectonic deformation in the interval above the recovered core." 5029 4 B 7 1 1 12 "4,089.62" "4,089.62" VOL intrusion NN NN 0 3101880 RZ 1 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 1 -999.25 -999.25 -999.25 -999.25 1 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 intrusion "A few green-brown, glassy, equant 2 mm grains with conchoidal fracture were seen and appear to be unaltered olivine." "Core run #7 recovered 12 cm of fine-grained incipiently altered diabase dike. The drilling process induced the core to break into 4 disk-like fragments with the breaks perpendicular to the core axis. There is a weak lineation on the fracture surfaces that is roughly parallel from core break to core break. Although the lineations have the appearance of tectonically related fractures, there does appear to be a slight alignment of plagioclase, and to a lesser extent pyroxene, along the lineation direction. This rock contains approximately 55% plagioclase, 40% pyroxene, and 5% titanomagnetite, with traces of olivine (?). Plagioclase occurs as clear, elongate crystals up to 4 mm but generally about 2 mm. On the cut surface, some plagioclase is seen to be slightly cloudy and greenish due to incipient alteration. There are sparse blocky plagioclase phenocrysts/glomerocrysts up to 5-6 mm across, and these also show some incipient alteration. The clinopyroxene is generally 2 x 2 mm in cross section, with some grains more elongated up to 4 mm. The elongated pyroxene is also weakly aligned with the plagioclase. The pyroxene is black to dark brown and appears to be clear and unaltered on the fracture surfaces, but the cut surface shows that there is variable alteration to grey-green amphibole. It is estimated that about 60% of the clinopyroxene is unaltered. The finer-grained interstitial patches show more pervasive greenish-blue patchy alteration. Titanomagnetite is much less abundant than in the overlying dikes, and is generally 2 mm and subhedral. A few green-brown, glassy, equant 2 mm grains with conchoidal fracture were seen and appear to be unaltered olivine. There are some sparse 1-2 mm patches of sulfide, dominantly pyrrhotite but including some chalcopyrite, that appear to be authigenic rather than immiscible sulfide. Several centimeters of rubbly fill were recovered above the cored interval. Much of it consists of angular fragments of dike rock identical to the cored material." 5029 4 B 8 1 1 20 "4,254.50" "4,254.50" VOL Fine-to medium-grained crystalline Basalt NN NN 0 3101882 RZ 3 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 3 -999.25 -999.25 -999.25 1 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 intrusion "Hornblende, replacing original pyroxene, and locally plagioclase, is pervasive in the matrix, and forms some cross cutting monomineralic replacement veins." "The core, and the majority of the fill, consists of fine grained intrusive, or possibly medium grained basalt, that is completely replaced by very fine-grained hornblende and secondary calcic plagioclase with subordinate amounts of metamorphic titanomagnetite and ilmenite. The mineral identifications were confirmed by examination of one of the fill fragments using XRD and Electron Microprobe analysis, and the following description includes observations made on the probe. In general, this unit is composed of approximately 60% black to dark green hornblende about 1 mm grain-size. The amphibole is equant to slightly elongate and locally there is a weakly defined foliation approximately perpendicular to the core axis. Hornblende, replacing original pyroxene, and locally plagioclase, is pervasive in the matrix, and forms some cross cutting monomineralic replacement veins. Locally hornblende is developed in shear-bands that have abundant fine-grained calcic plagioclase and fine-grained disseminated magnetite and ilmenite. Some, but not all, of the plagioclase in the shear bands shows small peaks (Energy Dispersive Spectrometer) for chlorine and sulfur suggesting the development of minor amounts of scapolite, but this needs further confirmation. Approximately 30-35% of the rock is calcic plagioclase, most of which is pseudomorphing igneous plagioclase. There are minor patches of more Na-rich patches that likely represent relict albitic alteration of the igneous plagioclase, but this plagioclase now has intermediate compositions with sub equal sodium and calcium content." 5029 4 B 10 1 1 23 "4,310.13" "4,310.13" VOL Fine grained basalt NN NN 0 3101884 RZ 3 -999.25 1 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 2 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 -999.25 intrusion "Locally, the core is cut by plagiogranite segregation veins and patches, the best developed of which is a 2 cm thick band dipping at approximately 70° to the core axis. Given the ~30° inclination of the drill hole, the vein may have originally been approximately horizontal. Where best developed, the plagiogranite is approximately 70% feldspar, most of which is anhedral and cloudy white." "All three recovered core pieces are half rounds, as all of the core broke along a core axis parallel fracture, and there was no fill above the recovered core. Dominant rock type is a fine-grained basaltic intrusive with a texture suggesting emplacement as a dike. The composition is approximately 40-45% elongated tabular plagioclase up to 2 mm with 45-50% interstitial dark brown subhedral pyroxene, about 1 mm across, and ~7% generally anhedral 1 mm titanomagnetite grains. The lower two core pieces contain less than 1% blocky plagioclase phenocrysts up to 3-4 mm and rare pyroxene phenocrysts up to 2-3 mm. The rock is extensively, but not completely, altered. Much of the feldspar is cloudy white to bluish green. Phenocrysts and coarser groundmass laths are more likely to be clear and glassy. Much of the pyroxene is greenish due to replacement by amphibole, but brown glassy pyroxene is preserved in places. The interstitial material is completely replaced by amphibole and greenish, cloudy plagioclase. Disseminated fine-grained anhedral sulfide is common, with Cu-Fe sulfide more abundant than pyrrhotite and pyrite. The plagiogranite contains approximately 20% green amphibole, some or all of which likely replaced original pyroxene. Amphibole shows a range of grain size from less than 1 mm to acicular crystals less than 1 mm in cross section and up to 3-4 mm long. There is ~10% fine-grained sub to euhedral titanomagnetite disseminated through the rock. Healed fractures cutting through some of the plagiogranite may have a small amount of subhedral grey quartz. A minor amount of disseminated fine-grained sulfide is present, mostly Cu-Fe sulfide, plus pyrite(?).This finding of plagiogranite is a noteworthy as it is the first recorded observation of plagiogranite from any of the geothermal fields of the Reykjanes peninsula."