Citation:

j.lithos.2012.03.017

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Coverage:

Median Latitude: 50.459631 * Median Longitude: -90.732840 * South-bound Latitude: 46.094400 * West-bound Longitude: -94.259000 * North-bound Latitude: 55.843800 * East-bound Longitude: -88.158900

Minimum Elevation: 130.0 m * Maximum Elevation: 420.0 m

Event(s):

Fox_River_Belt * Latitude: 55.814590 * Longitude: -94.047910 * Elevation: 130.0 m * Location: Canada, Fox River Belt

Hemlock_Formation * Latitude: 46.129226 * Longitude: -88.225813 * Elevation: 420.0 m * Location: Canada

Pickle_Crow * Latitude: 51.486328 * Longitude: -90.151903 * Elevation: 351.0 m * Location: Canada

Parameter(s):

#	Name	Short Name	Principal Investigator	Comment
1	Event label	Event
2	Sample code/label	Sample label	Minifie, Matthew J
3	Lithologic unit/sequence	Unit	Minifie, Matthew J
4	LATITUDE	Latitude		Geocode
5	LONGITUDE	Longitude		Geocode
6	Rock type	Rock	Minifie, Matthew J
7	Comment	Comment	Minifie, Matthew J	description of thin section
8	Comment 2 (continued)	Comm 2	Minifie, Matthew J
9	Comment 3 (continued)	Comm 3	Minifie, Matthew J
10	Comment 4 (continued)	Comm 4	Minifie, Matthew J

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

180 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Event	2 Sample label	3 Unit	4 Latitude	5 Longitude	6 Rock	7 Comment	8 Comm 2	9 Comm 3	10 Comm 4
Fox_River_Belt	MMFR08-1	Fox River Belt	55.8197	-94.2361	Basalt	Altered clinopyroxene blades and plagioclase laths are set in a dusty brown glassy matrix. Maximum size of crystals is ~0.3 mm. Clinopyroxene commonly replaced with chlorite whereas plagioclase laths are sericitised.	Opaque minerals present but rare. Dusty appearance of section obliterates textures.
Fox_River_Belt	MMFR08-2	Fox River Belt	55.8118	-94.2548	Picrite	~10% is composed of olivine phenocrysts which have been altered to chlorite, actinolite and carbonate. Occur in a variety of shapes from equant euhedral crystals to elongated blades.	Olivines are set in a very dusty brown matrix in which are some very thin blackish needles (?clinopyroxene). Opaque minerals are very small and euhedral. Calcite veins are present.
Fox_River_Belt	MMFR08-3	Fox River Belt	55.8114	-94.2569	Picrite	~15% olivine present as euhedral hexagons, diamonds and squares. Altered mostly to chlorite, but also minor serpentine, tremolite and talc. Clinopyroxene present as skeletal needles and ornamental chains (~5%).	These are randomly oriented and much less altered than olivines. The longest needle is ~2.5 mm. Matrix (~80%) is a dusty brown colour and includes some very fine clinopyroxene needles.
Fox_River_Belt	MMFR08-4	Fox River Belt	55.8113	-94.2571	Basalt	Olivine (~3%) often as euhedral to subhedral grains but sometimes more rounded. Average ~0.5 mm in longest dimension. Altered to chlorite and actinolite. Small euhedral opaques (~1%) altering to sphene.	Olivines and opaques set in a dusty brown matrix (~96%) with fine clinopyroxene needles.
Fox_River_Belt	MMFR08-5	Fox River Belt	55.8110	-94.2590	Basalt	~2% olivine, ~13% clinopyroxene, ~2% opaques, ~83% brownish groundmass. Small (~0.2 mm) equant grains of olivine altered to chlorite and carbonate.	Long thin needles/blades of clinopyroxene (up to ~1.5 mm) randomly oriented and much less altered than olivine. Small euhedral opaque crystals sometimes altering to sphene.	Groundmass is mainly dusty brown but also appears to comprise of very fine, wispy needle-like crystals of possibly clinopyroxene.
Fox_River_Belt	MMFR08-6	Fox River Belt	55.8043	-94.1575	Basalt	Slightly coarser than most other Fox River lavas. Opaques (~5%) occur as both small euhedral crystals and larger anhedral masses. Plagioclase phenocrysts (~10%) mainly subhedral to anhedral crystals (up to ~1.2 mm) altering to clays and chlorite.	Clinopyroxene (~15%) present as elongate prisms. The longest prism is ~2.5 mm long. Clinopyroxene alters to tremolite. A fine dusty matrix comprises ~70% of the section and appears to contain tiny plagioclase crystals.
Fox_River_Belt	MMFR08-7	Fox River Belt	55.8438	-94.1239	Basalt	Quite altered. ~65% plagioclase, ~33% clinopyroxene, ~2% opaques. Plagioclase occurs as laths (maximum ~0.4 mm length) which have gone to clays and chlorite.	Small (~0.1 mm) subhedral crystals and the occasional larger (~0.5 mm) equant crystals are present and may originally have been clinopyroxene, now altered to chlorite, carbonate and actinolite-tremolite. Opaques present mostly as large ragged patches.
Fox_River_Belt	MMFR08-8	Fox River Belt	55.8312	-94.1333	Picrite	Polyhedral olivine in a variety of shapes and some clinopyroxene comprise ~30% of section and are set in a finer matrix of a plumose mineral (probably clinopyroxene) and its alteration products. Largest olivine blade is ~2.2 mm in length.	Olivine is variably altered. Some crystals are fresh, others have completely gone to serpentine and amphibole. Tiny opaque minerals scattered around.
Fox_River_Belt	MMFR08-9	Fox River Belt	55.8291	-94.1339	Picrite	Variety of shapes of olivine; euhedral hexagons, equant hoppers, elongated blades, ornamental chains. Longest needle is 3.5 mm long. Olivine altered to serpentine, actinolite and chlorite.	Clinopyroxene present as fine acicular needles which are randomly dispersed. Small euhedral opaques have gone to sphene. Matrix is a dusty brown, altered glass-like material. ~15% olivine, ~3% clinopyroxene, ~1% opaques, ~81% glass.
Fox_River_Belt	MMFR08-10	Fox River Belt	55.8260	-94.1344	Picrite	~35% olivine, ~5% clinopyroxene, <1% opaques, ~59% matrix. Olivine present as subhedral grains to ~1 mm long elongated blades and all altered to serpentine and actinolite.	Clinopyroxene is much less altered and present as elongated prisms ~1 mm in length. Most opaques are diamond-shaped and appear to be altering to sphene.	Olivine and clinopyroxene set in a dusty brown matrix which includes lots of fine needles possibly microspinifex clinopyroxene.
Fox_River_Belt	MMFR08-11	Fox River Belt	55.8054	-93.8287	Basalt	Section dominated by fine laths of plagioclase and higher relief blades of clinopyroxene in roughly equal quantities. Laths of plagioclase are randomly oriented and are generally ~0.3 mm in size.	Most plagioclase laths are altered to clays and carbonate but a few remain relatively unaltered and are twinned. Clinopyroxene blades range up to ~1.2 mm in size. Opaque minerals rare. Matrix is very fine grained and dusty brown in colour.
Fox_River_Belt	MMFR08-12	Fox River Belt	55.8033	-93.8293	Basalt	Most of the section is composed of a devitrified glassy brown matrix. Small phenocrysts of altered clinopyroxene and plagioclase constitute ~5% of section. Laths of plagioclase, usually ~0.3 mm, are altered to sericite and carbonate.	Clinopyroxene present as euhedral and subhedral crystals, many having diamond shapes. The longest diamond is ~0.5 mm. Clinopyroxene has been serpentinised, some crystals surrounded by opaques, and some partially replaced by chlorite.	Possible ophitic textures observed. Also present are abundant colourless, very thin needles ~0.2 mm in length. Could be skeletal plagioclase. Carbonate and chlorite veins cut section.
Fox_River_Belt	MMFR08-13	Fox River Belt	55.7981	-93.8304	Picrite	Olivine occurs as euhedral hopper crystals which are altered mostly to serpentine. These are typically ~0.3 mm in size and comprise ~10% of the section. Very few opaques and they occur as tiny euhedral and subhedral blebs within olivines.	~90% of section is a dark brown altered glassy matrix which also contains small colourless needles, possibly clinopyroxene?
Fox_River_Belt	MMFR08-14	Fox River Belt	55.7976	-93.8319	Picrite	~20% olivine, ~10% clinopyroxene, ~70% altered glass matrix. Olivines mainly euhedral hopper crystals with a maximum size of 0.5 mm, although some elongated crystals ~1 mm long are present. Altered to serpentine and chlorite.	Clinopyroxene much less altered and occurs as skeletal needles and ornamental chains randomly oriented. Longest needle is ~2.5 mm. Trace of opaques which are mostly euhedral square-shapes. Matrix is very fine and a dark brown colour.
Hemlock_Formation	MMH08-1	Hemlock Formation (Group 2)	46.1575	-88.2304	Basalt	Fine grained rock with a general green colour. Aphyric. Tiny colourless crystals with low birefringence could be plagioclase. Some of the green material appears to have moderate birefringence and could be actinolite.	Other green material is nearly isotropic and could be chlorite. Yellow subhedral crystals of epidote and some opaque minerals scattered around.	Rock appears to be foliated which is best defined by actinolite needles. Stretched (~3.5 mm long) chlorite-filled vesicles present as are veins of chlorite.
Hemlock_Formation	MMH08-4	Hemlock Formation (Group 2)	46.1541	-88.2177	Basalt	Laths and ragged plates of plagioclase (up to ~0.75 mm in length) are mostly partly sericitised. Some have partially altered to chlorite and carbonate.	Also present are ragged plates of pale green, fibrous actinolite which probably formed from clinopyroxene. No obvious groundmass due to alteration. ~60% plagioclase, ~30% actinolite, ~10% opaques and chlorite.
Hemlock_Formation	MMH08-5	Hemlock Formation (Group 2)	46.1548	-88.2189	Basalt	Laths and ragged blades of colourless plagioclase (~0.3 mm) set in a greenish matrix of plagioclase, carbonate, acicular actinolite, chlorite, opaques and maybe epidote.	Also present are thin, elongate minerals which are dark brown and have a masked birefringence and appear speckly in crossed polars (?biotite).	These dark brown minerals appear oriented and define foliations in the rock. Plagioclase phenocrysts ~20%, dark brown ?biotite ~2%, ~78% greenish matrix.
Hemlock_Formation	MMH08-6	Hemlock Formation (Group 2)	46.1494	-88.1821	Dacite	Section cut too thick. Quartz and feldspar appear orange. 'Eyes' of quartz, quartz and sericite, and sericitised feldspar comprise ~5% of thin section. Set in a much finer grained matrix dominated by quartz.	Eyes vary in shape from circular to more elongated oval shapes (up to ~1.5 mm) possibly due to deformation. Some eyes composed of a single quartz crystal showing undulose extinction, some quartz eyes show mosaic textures.	Some patches of elongated sericite may be stretched feldspar pseudomorphs. Only a few eyes are composed of sericitised feldspar. The groundmass is mostly very fine grained quartz with very little feldspar.	Some apatite, biotite and zircon observed. Opaque minerals also occur mainly in cracks presumably created during deformation events.
Hemlock_Formation	MMH08-7	Hemlock Formation (Group 1)	46.0958	-88.1610	Basalt	Plagioclase present as subrounded grains as well as thin laths (longest is ~0.5 mm) Some plagioclase going to chlorite. Fibrous pale green actinolite forms ragged prisms, typically also ~0.5 mm long.	These are set in a fine matrix of plagioclase, acicular actinolite, chlorite, opaques and scattered epidote. Rough estimate ~55% plagioclase, ~30% actinolite, ~ 15% other minerals.
Hemlock_Formation	MMH08-8	Hemlock Formation (Group 1)	46.0944	-88.1589	Basalt	Prisms of pale green actinolite and laths of sericitised plagioclase ~0.5 mm long set in a fine groundmass which contains plagioclase, acicular actinolite, chlorite, epidote and opaque minerals.
Hemlock_Formation	MMH08-9	Hemlock Formation (Group 2)	46.1129	-88.2085	Basalt	Laths of altered plagioclase and prisms of actinolite are the dominant two minerals and are set in a greenish chloritised matrix. Plagioclase is altered mainly to sericite. Some actinolite going to chlorite.	Maximum length of plagioclase laths is 1 mm. A few opaque minerals scattered around.
Hemlock_Formation	MMH08-11	Hemlock Formation (Group 3)	46.1178	-88.2204	Basalt	Few phenocrysts present. Scattered blades and laths of plagioclase (up to ~1 mm in size) set in a finer, chloritised matrix. Also present in the matrix are plagioclase laths, epidote, carbonate and opaques. Plagioclase altered to sericite and chlorite.
Hemlock_Formation	MMH08-12	Hemlock Formation (Group 2)	46.1161	-88.2207	Basalt	Prisms of actinolite and ragged blades of plagioclase present. Blades of plagioclase extend for up to ~1.5 mm. Plagioclase altered to sericite and clays and appears dusty.	Groundmass is a greenish colour and appears to be composed of actinolite, plagioclase and chlorite. Small (<0.1 mm) brownish crystals present and appear to be lozenge-shaped. ~15% actinolite, ~15% plagioclase, ~70% green matrix.
Hemlock_Formation	MMH08-13	Hemlock Formation (Group 3)	46.1144	-88.2191	Basalt	Ragged blades of plagioclase (~1 mm) and subhedral prisms of pale green actinolite set in a fine grained matrix. Plagioclase variably altered to chlorite and sericite.	Matrix appears to be composed of chloritised laths of plagioclase and needles of actinolite, plus epidote and opaque minerals.
Hemlock_Formation	MMH08-14	Hemlock Formation (Group 2)	46.1095	-88.2257	Basalt	Phenocryst-poor. Only a few laths and blades of plagioclase set in a finer grained matrix. Longest blade is ~3 mm in length. Green patches in plagioclase phenocrysts are chlorite. Plagioclase also alters to clays and sericite.	Matrix consists of very fine laths of plagioclase, epidote, opaques and chlorite. Veins of chlorite and carbonate present.
Hemlock_Formation	MMH08-15b	Hemlock Formation (Group 2)	46.1076	-88.2322	Basalt	Quite an altered sample. Cannot make out original mineralogy or texture. Amygdales comprise ~10% of section. Most are rounded but some are stretched, one is even fractured and the two halves are displaced.	Most are composed of quartz with mosaic textures but some also contain chlorite and some biotite. The largest amygdale is ~4 mm in diameter. Amygdales sit in a chloritised matrix with some biotite and opaque minerals which appear aligned in bands.	~25% of section is quartz with patches of chlorite. The quartz shows mosaic textures and undulose extinction.
Hemlock_Formation	MMH08-18	Hemlock Formation (Group 4)	46.1129	-88.2110	Basalt	Plagioclase laths (~0.6 mm) are partially altered to sericite and chlorite. Subhedral grains of pale green, weakly pleochroic actinolite. Set in a matrix containing very fine grained plagioclase laths, epidote, chlorite, and euhedral opaque minerals.
Hemlock_Formation	MMH08-19	Hemlock Formation (Group 2)	46.1127	-88.2079	Basalt	Laths of plagioclase ~0.5-0.75 mm in length. These are partly altered to sericite and chlorite. Some ophitic texture observable as plagioclase laths 'protrude' into plates of pale green actinolite. Chlorite replaces actinolite and plagioclase.	Minor amounts of biotite occur and are associated with chlorite. Brown, euhedral, high relief, masked birefringence minerals present (?sphene). ~30% chlorite, ~25% actinolite, ~40% plagioclase, ~5% sphene and other minerals.
Hemlock_Formation	MMH08-20	Hemlock Formation (Group 3)	46.1307	-88.2251	Basalt	Pale green actinolite prisms and ~1.5 mm long laths of plagioclase set in a green, chloritised matrix. Matrix also contains fine laths of plagioclase, epidote and opaque minerals. Plagioclase laths are variably altered to sericite and chlorite.
Hemlock_Formation	MMH08-21	Hemlock Formation (Group 3)	46.1296	-88.2241	Basalt	Aphyric. Fine groundmass-like section composed of small plagioclase laths and stubs and needles of actinolite which are all variably altered to chlorite.	Also included in the fine grained assemblage is epidote, zoisite, carbonate and lots of tiny brown minerals (possibly sphene).
Hemlock_Formation	MMH08-22	Hemlock Formation	46.1306	-88.2281	Basalt	Intersertal texture with plagioclase laths (~0.3 mm) and squarer plates set in a finer grained matrix. Evidence of alteration to sericite and chlorite. The squarer plates are more altered to chlorite and appear green.	Opaques are most abundant within the chlorite. The matrix appears green due to the presence of chlorite and actinolite.	Also the matrix contains plagioclase, opaques and high relief, dark brown minerals (?sphene). ~15% plagioclase phenocrysts, ~85% greenish matrix. One quartz vein cuts through sample.
Hemlock_Formation	MMH08-23b	Hemlock Formation	46.1209	-88.3367	Basalt	Plagioclase laths and rounder phenocrysts have altered to sericite and/or chlorite. The laths are up to ~0.5 mm in length whereas the rounded crystals are ~0.7 mm in diameter. They are set in a near isotropic matrix probably dominated by chlorite.	Chlorite and carbonate veins present. All of the section is stained a reddish-brown colour.
Pickle_Crow	MMPC07-1	Pickle Crow dyke	51.4878	-90.1478	Dolerite	~50% plagioclase mostly in the form of laths (maximum ~0.6 mm in length) but also as subrounded crystals. These are not too altered. Small rectangular and small, rounder opaque crystals with ragged edges present (~1%).	Hornblende present (~1%) as brown pleochroic prisms which are partly altered to chlorite. Colourless prisms possibly of clinopyroxene also present (~1%). Ophitic textures observed but not abundant.	~47% of section composed of dusty brown material which may be badly altered clinopyroxene and plagioclase to clays. Opaque minerals present.
Pickle_Crow	MMPC07-2	Pickle Crow dyke	51.4873	-90.1499	Gabbro	Coarse grained gabbro with some ophitic textures preserved. ~55% plagioclase, ~35% pyroxene and amphibole, ~10% opaques. Clinopyroxene appears to alter to actinolite and chlorite. A minor amount of primary hornblende.	Prisms of clinopyroxene ~2.5 mm long. Plagioclase occurs as thick laths with albite twinning and varying degrees of alteration to clays and sericite. Chlorite occasionally surrounds plagioclase.
Pickle_Crow	MMPC07-3	Pickle Crow dyke	51.4863	-90.1560	Gabbro	Coarse grained gabbro very similar to previous sample. Same mineralogy and textures as noted above.