Jurassic basalts of northern Bay of Fundy region, Nova Scotia

Stevens, George

doi:10.1130/0-8137-5405-4.415

Cited by 4 publications

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“…Using a combined biostratigraphic and facies argument, Olsen (1981) argued that the McKay Basalt and the Five Islands volcanics represent the same set of lava flows as the North Mountain Basalt, concurring with Liew. This interpretation has generally been followed (Stevens 1980(Stevens , 1987Williams et al 1985;Tanner 1996), and the thick, mostly red sedimentary unit above the North Mountain Basalt was informally designated as the McCoy Brook formation on maps and in guidebooks (Donohoe and Wallace 1978: Keppie 1979. Tanner (1996) Outliers of the Fundy Group occur along the Fundy coast of New Brunswick.…”

Section: [Traduit Par La Redaction]mentioning

confidence: 98%

Stratigraphic and temporal context and faunal diversity of Permian-Jurassic continental tetrapod assemblages from the Fundy rift basin, eastern Canada

Sues

Olsen

2015

atgeol

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The Fundy basin in Nova Scotia and New Brunswick is the largest exposed rift basin of the Newark Supergroup and also extends beneath the Bay of Fundy. Its strata can be divided into four tectonostratigraphic sequences (TS). TS I is represented by the probably Permian Honeycomb Point Formation and possibly the Lepreau Formation. TS II includes the Wolfville Formation with the probably Middle Triassic Economy Member and the early Late Triassic Evangeline Member. These members have yielded markedly different assemblages of continental tetrapods. TS III comprises most of the Blomidon Formation, which is Norian to Rhaetian in age. The Blomidon Formation has yielded few skeletal remains of tetrapods to date but many tetrapod tracks. TS IV includes the late Rhaetian top of the Blomidon Formation and the McCoy Brook Formation, which overlies the North Mountain Basalt and is latest Rhaetian and earliest Jurassic (Hettangian) in age. The McCoy Brook Formation has yielded a diversity of continental tetrapods and lacks any of the characteristic Late Triassic forms. Recent work has correlated the Global Boundary Stratotype Section and Point (GSSP) for the base of the Jurassic (Hettangian) to a level well above the North Mountain Basalt. Thus most of the tetrapod fossils from the McCoy Brook Formation are latest Rhaetian in age, but the higher horizon with skeletal remains of sauropodomorph dinosaurs may be earliest Hettangian in age. The Fundy basin preserves the only known, stratigraphically tightly constrained record of the profound biotic changes in continental ecosystems across the Triassic-Jurassic transition.

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Section: [Traduit Par La Redaction]mentioning

confidence: 98%

Stratigraphic and temporal context and faunal diversity of Permian-Jurassic continental tetrapod assemblages from the Fundy rift basin, eastern Canada

Sues

Olsen

2015

atgeol

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“…A linear series of outcrops extending from the westernmost tip of Economy Mountain toward the Five Islands contains angular blocks of vesicular basalt surrounded by nonvesicular basalt. This phenomenon and the relationships to massive and columnar jointed basalts prompted Powers (1916) to suggest that the outcrops represent remnants of a feeder-vent system for the basalt, a conclusion supported by Stevens (1987 For personal use only.…”

Section: Geological Settingmentioning

confidence: 91%

Petrochemical and stratigraphic aspects of North Mountain basalt from the north shore of the Bay of Fundy, Nova Scotia, Canada

Greenough¹,

Jones²,

Mossman³

1989

Can. J. Earth Sci.

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Early Jurassic quartz-normative tholeiitic basalts occur in a series of fault blocks at four localities (Cap d'Or, Parrsboro, Five Islands, and Bass River) along the north shore of the Bay of Fundy. Major-element and trace-element data show that they represent outliers of the North Mountain basalt (NMB), which from the south shore of the Bay of Fundy are well-known. Diagnostic 87Sr186Sr ratios (~0 . 7 0 6 0 9 ) indicate that a thick (>90 m) flow at Five Islands and Cap d'Or represents the lower unit of NMB, thus extending this single flow's lateral extent to 230 km. Thin flows overlying the thick flow at Cap d'Or suggest that the middle unit of NMB also occurs on the north shore. A thick flow at McKay Head (Parrsboro area) shows a variable Sr isotopic composition that is probably a result of metasomatism (with Rb addition) along the Cobequid fault. The average composition (0.70656) is similar to that of the upper unit of NMB. If the flow does represent the upper unit, then four thinner flows above it form an "overlying unit" not recognized along North Mountain. Although the nature of contacts between the middle and upper units was not observed, a lack of sedimentary rocks between all other flow units indicates that little or no sedimentation occurred between basalt eruptions. North shore basalts appear less mafic (more evolved) than south shore basalts, providing support for the hypothesis of differentiation during northeasterly magma migration through dykes that fed 230 km long fissure eruptions.Les basaltes tholkiitiques B quartz normatif, d'ige jurassique prkcoce, apparaissent dans une strie de blocs faillks i i quatre endroits (Cap d'Or, Parrsboro, Five Islands et Bass River) le long de la rive nord de la baie de Fundy. Les teneurs d'klkments majeurs et d'klkments traces dkmontrent que ces basaltes reprksentent des lambeaux de charriage du basalte de North Mountain (BNM) qui abonde sur la rive sud de la baie de Fundy. Les rapports caracttristiques 87sr/s6Sr (~0 , 7 0 6 0 9 ) indiquent que l'tpaisse coulte (>90 m) B Five Islands et Cap d'Or reprksente l'unitk inftrieure du BNM, portant ainsi l'extension lattrale de cette coulte simple ? i 230 km. Les coulkes minces gui surplombent l'tpaisse coulke de Cap d'Or suggbrent que l'unitt centrale du BNM a aussi kt6 charrik sur la rive nord. A McKay Head (rtgion de Parrsboro), la variation de la composition isotopique du Sr dans une tpaisse coulke est probablement due au mktasomatisme (avec ajout de Rb) produit le long de la faille de Cobequid. La composition moyenne (0,70656) est analogue B celle de l'unitt sugrieure du BNM. Si la coulte reprtsente rkllement l'unitk supkrieure, alors les quatre coulkes plus minces au-dessus d'elle foment une .unit6 sus-jacente* non-identifite le long de North Mountain. M&me si les types de contacts entre les unit& centrale et suptrieure n'ont pas kt6 obsemks, l'absence de roches skdimentaires skparant toutes les autres coulkes indique que la sedimentation Ctait faible ou nulle entre les truptions basaltiques. Le fait que les basalt...

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Influence of preexisting fault fabric on inversion-related deformation: A case study of the inverted Fundy rift basin, southeastern Canada

2010

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[1] Preexisting zones of weakness significantly influenced the structural development of the Fundy basin during rifting and subsequent basin inversion. The preexisting fabric, consisting of NE striking faults with gentle dips and east striking faults with steeply dipping upper segments and gently dipping lower segments, formed during Paleozoic and older orogenic activity. During Mesozoic rifting, the preexisting fabric was reactivated, creating a border-fault system composed of linked NE and east striking extensional fault zones with anomalous dips (gentle and steep) compared to those of newly formed normal faults. During inversion, the preexisting fabric was again reactivated as the hanging wall of the composite border-fault system moved NNE relative to the footwall. Inversion was highly oblique on the NE striking fault zones, producing gentle faultparallel buttress folds and fault-perpendicular detachment folds above the low-angle fault zones. Inversion was moderately oblique on the east striking fault zone, producing relatively tight fault-parallel buttress and detachment folds above the gently dipping lower fault segments and reactivating the steeply dipping upper fault segments as left-lateral strike-slip faults. Thus, inversion-related deformation on the east striking fault zone was partitioned at shallow levels (i.e., partitioned updip). Our work shows that the geometry of preexisting extensional faults and their obliquity relative to the shortening direction profoundly affect deformation style during basin inversion. Namely, the type of inversionrelated faults, the type and shape of inversion-related folds, and the distribution of deformation (e.g., updip partitioning) depend, in part, on the geometry of the preexisting extensional faults and the variations in these geometries with depth and along strike. Citation: Withjack, M. O., M. S. Baum, and R. W. Schlische (2010), Influence of preexisting fault fabric on inversion-related deformation: A case study of the inverted Fundy rift basin, southeastern Canada, Tectonics, 29, TC6004,

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Jurassic basalts of northern Bay of Fundy region, Nova Scotia

Cited by 4 publications

References 0 publications

Stratigraphic and temporal context and faunal diversity of Permian-Jurassic continental tetrapod assemblages from the Fundy rift basin, eastern Canada

Stratigraphic and temporal context and faunal diversity of Permian-Jurassic continental tetrapod assemblages from the Fundy rift basin, eastern Canada

Petrochemical and stratigraphic aspects of North Mountain basalt from the north shore of the Bay of Fundy, Nova Scotia, Canada

Influence of preexisting fault fabric on inversion-related deformation: A case study of the inverted Fundy rift basin, southeastern Canada

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