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Karst in Mid-Proterozoic Dolomite, Pungalina Station, Northern Territory, Australia – Its Significance and Management

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Karst in Mid-Proterozoic Dolomite, Pungalina Station, Northern Territory, Australia – Its Significance and Management Karst in Mid-Proterozoic dolomite, Pungalina Station, Northern Territory, Australia – its Significance and Management Nicholas White1 and Susan White 1, 2 1Victorian Speleological Association Inc 2Environmental Geoscience, Latrobe University, Bundoora 08 Australia Abstract tion of summer rain, temperature and the effect of soil Extensive karst is reported from several places in heated up by the sun. In some caves, the humidity is Northern Australia in particular Pungalina Station in the such that just moving around causes the moisture to con- Northern Territory. This previously little known dolomite dense as droplets and produce a fog. Some caves flood karst area contains significant karst, which has been during the summer monsoonal rains maintaining the high explored and documented by the Victorian Speleological humidity. Association Inc., since 2005. Since the purchase of the The karst areas of the property have a mosaic of open property by the Australian Wildlife Conservancy (AWC) savannah woodland with pandanas and paperbark com- in 2008, VSA has continued this work and provides karst munities around the creeks and wetlands. Cave entrances knowledge and management advice to AWC. often have remnant dry rainforest species not present in Introduction In the published literature, karstification in dolomite (dolostone) is not as well documented as for limestone and as it is less soluble in natural waters than limestone, cave development is generally less. However, extensive karst is reported from several places in the Northern Ter- ritory, Australia and the Transvaal, South Africa (Martini, 2004). A previously little known karst area, of about 150 km2, in the Mid Proterozoic (Pre Cambrian) stromatolitic and cherty Karns Dolomite on the southwestern coast of the Gulf of Carpentaria (N.T.) contains significant karst including caves. Although the Karns Dolomite was known to geolo- gists, the karst potential had never had any investigation. As a result the karst was not well known until the Punga- lina Station owner Owen Davies started operating it as a Safari Operation in partnership with Kirkhope Aviation. Their interest in the caves was as an additional feature to Figure 1: Pungalina location the usual safari activities for tourists. At that stage they knew of one major cave with bats and a few other smaller the surrounding savannah woodlands. The diverse habi- caves. Since 2005, VSA has undertaken 5 further expedi- tats support a rich fauna. tions to the area, discovering, exploring and mapping a number of caves and karst features. Geology and Geomorphology Access to the area is very dependent on conditions; The karst is developed in the Karns Dolomite, a 100- a heavy summer wet can limit access and movement 200 m thick cherty dolostone estimated as being between around the property. VSA trips as a result, have been in 1.73 to 1.43 billion years i.e. mid Proterozoic (Pre Cam- June or early July. brian) in age. The Karns Dolomite is only intermittently exposed on the surface in this area as it is overlain in Regional Setting some places, by the very late Proterozoic Bukalara Sand- The area is located in the Gulf Coastal bioregion of the stone, isolated outliers of marine Cretaceous sandstone Northern Territory (Fig. 1) near the Queensland/North- and claystone and Cenozoic sediments and laterite. ern Territory border and the Savannah Way (Highway The Karns Dolomite was deposited in a shallow 1). The Calvert River flows north through the property marine, tidal environment, characterised by numerous and terminates in the Gulf of Carpentaria. The currently stromatolitic beds dominated by the genus Conophyton known karst is predominantly in the exposed dolostone (Fig. 2). Such shallow, upper tidal environments have a in the catchment of the Karns Creek, a tributary of the variety of sediments reflecting the variable depositional Calvert River. depths. These include more siliceous and clay rich beds, At about16°30’ S. latitude, Pungalina has a hot mon- now evident only either in cave walls or as surface soonal climate dominated by distinct wet and dry sea- rubble. The dolomite is relatively flat lying and exhibits sons. The cave temperatures are higher (29-34°C) than only shallow dips and small structural deformations. the expected yearly average (26.4°C) with cave humidity In the upper reaches of Karns Creek, several hills and levels close to 100%. This is possibly due to a combina- tabular plateaux are capped with a massive banded chert, brecciated in places and up to 10m thick. This appears Karstaway Konference Proceedings 27th ASF Biennial Conference Sale Victoria January 2009 77 to terminate the dolostone sequence which may be a dolines and solutional features. Proterozoic paleosol residual left after the dissolution of The upper caves are no longer being actively devel- cherty carbonates and subsequently cemented together oped, although minor modification is occurring from into a massive rock under the effect of diagenesis or very surface runoff into the caves and degradation of old spe- low-grade metamorphism. leothems (e.g. the Totem Pole in Totem Pole Cave (PUN- There is a significant gap in the rock history between 07) (Fig. 3) and deposition of newer formation in other the cessation of sedimentation in the late Proterozoic and parts of the cave. The younger and currently active karst the Cretaceous when extensive sedimentary deposition development stage is occurring with the formation and of sandstones occurred (~ 400 million years of record modification of narrow, joint controlled maze-like caves missing). Either the area had no deposition or, as is lower on the ridges, forming especially where surface most likely, any deposition that occurred during the Pal- runoff drains underground through joints and fractures, at the break of slope near the base of the ridges. These are the main caves in the region and have concentrated areas of decoration and calcite formation, interspersed with extensive areas showing solutional features such as rills. These caves also take extensive water during wet seasons and most have evidence of episodic flooding and active solution. There is extensive evidence in the form of small water sinks and degraded dolines and hollows, that the area was a more impressive karst landscape in the past. The surface of the dolostone ridges has extensive karren especially as kamanitzas or pans rather than solu- tional rills. The stromatolites are often “picked out” by solution. Figure 2: Conyphyton stromatolites (S. White) Modern tufa deposits occur in the bed of a small creek near the present homestead. These indicate that the river is highly saturated in calcium carbonate and at specific aeozoic and early Mesozoic (543 – 146 million years), places is capable of deposition. was minimal and was subsequently completely eroded. There are only small remnants of Cretaceous sediments Groundwater outflow points were observed close present, which indicates that the extensive deposition, to Karns Creek and the Calvert River and more must which occurred, has been subsequently eroded during the occur during the wet season, as evidence of outflow was Cenozoic. The area has been subjected to more sub-aerial found in a few places. The warm ( ~28º C) Bubbling erosion throughout the Cenozoic. Springs which flow regularly all year round suggest that the ground water flow is slow, buffered by the residual Karst Landscape Development overburden covering the karst as well as by the nature The geological history indicated that the area was of the wet cave network, which is probably not well probably covered by sediments in the Cretaceous, but integrated. by the end of the Cretaceous, the area was exposed and eroding. Extensive landscape lowering has occurred and Caves and karst the remnants of a higher altitude landscape with large Over 50 caves, 20 significant dolines, 2 poljes and streams and high level caves on the ridge tops, resulting several karst springs have been documented. More in a landscape inversion (stream cobbles are found on detailed work is needed. some ridge tops). Much of the karst has the characteris- The caves were initially found from the local knowl- tics of a highly eroded landscape where the present features are the relics of previous conditions. The major relief of the area is seen in the sand- stones outcropping to the south and west of the main karst area. The relative relief of the sandstone areas is high – up to 100 m of incision by the Cal- vert River in places with striking sandstone cliffs. The relative relief of the Karns Dolomite areas is much lower and flatter. The tops of the ridges are 10- 25 m above the rest of the plain. At least two periods of karst development on the Karns Dolomite have occurred, and there may have been more. The two karst development periods are an upper/older one, which is preserved as remnants on ridge tops e.g. remnant streams, dolines and caves, and a lower/younger one at the break of slope at the foot of the ridge with currently active caves. Other small karst features include degraded Figure 3: Totem Pole in PUN -7 (D. Carr) Karstaway Konference Proceedings 27th ASF Biennial Conference Sale Victoria January 2009 78 edge of Owen Davies and subsequently from locations of intense faulting and folding occur to the west. Some dolines viewed from the air and from air photos. Since faulting and relatively gently warping has occurred but the first expedition, exploration has been by walking the dolostones are relatively flat lying. The preliminary to likely places at the break of slope between ridge and information from speleothems indicates that there is plain where there are some discharge caves. On ridges significant potential for detailed climatic information the presence of green vegetation is often associated with to be obtained. This is particularly important as there sheltered dolines sometimes with caves present.
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