title: History of oceanic front development in the New Zealand sector of the Southern Ocean during the Cenozoic--a synthesis

authors: Nelson, Campbell S.

subjects: New Zealand

abstract: The New Zealand sector of the Southern Ocean (NZSSO) has opened about the Indian-Pacific spreading ridge throughout the Cenozoic. Today the NZSSO is characterised by broad zonal belts of antarctic (cold), subantarctic (cool), and subtropical (warm) surface-water masses separated by prominent oceanic fronts: the Subtropical Front (STF) c. 43deg.S, Subantarctic Front (SAF) c. 50deg.S, and Antarctic Polar Front (AAPF) c. 60deg.S. Despite a meagre database, the broad pattern of Cenozoic evolution of these fronts is reviewed from the results of Deep Sea Drilling Project-based studies of sediment facies, microfossil assemblages and diversity, and stable isotope records, as well as from evidence in onland New Zealand Cenozoic sequences. Results are depicted schematically on seven paleogeographic maps covering the NZSSO at 10 m.y. intervals through the Cenozoic. 
During the Paleocene and most of the Eocene (65-35 Ma), the entire NZSSO was under the influence of warm to cool subtropical waters, with no detectable oceanic fronts. In the latest Eocene (c. 35 Ma), a proto-STF is shown separating subantarctic and subtropical waters offshore from Antarctica, near 65deg.S paleolatitude. During the earliest Oligocene, this front was displaced northwards by development of an AAPF following major global cooling and biotic turnover associated with ice sheet expansion to sea level on East Antarctica. Early Oligocene full opening (c. 31 Ma) of the Tasmanian gateway initiated vigorous proto-circum-Antarctic flow of cold/cool waters, possibly through a West Antarctic seaway linking the southern Pacific and Atlantic Oceans, including detached northwards "jetting" onto the New Zealand plateau where condensation and unconformity development was widespread in cool-water carbonate facies. Since this time, a broad tripartite division of antarctic, subantarctic, and subtropical waters has existed in the NZSSO, including possible development of a proto-SAF within the subantarctic belt. In the Early-early Middle Miocene (25-15 Ma), warm subtropical waters expanded southwards into the northern NZSSO, possibly associated with reduced ice volume on East Antarctica but particularly with restriction of the Indonesian gateway and redirection of intensified warm surface flows southwards into the Tasman Sea, as well as complete opening of the Drake gateway by 23 Ma allowing more complete decoupling of cool circum-Antarctic flow from the subtropical waters. During the late Middle-Late Miocene (15-5 Ma), both the STF and SAF proper were established in their present relative positions across and about the Campbell Plateau, respectively, accompanying renewed ice buildup on East Antarctica and formation of a permanent ice sheet on West Antarctica, as well as generally more expansive and intensified circum-Antarctic flow. 
The ultimate control on the history of oceanic front development in the NZSSO has been plate tectonics through its influence on the paleogeographic changes of the Australian-New Zealand-Antarctic continents and their intervening oceanic basins, the timing of opening and closing of critical seaways, the potential for submarine ridges and plateaus to exert some bathymetric control on the location of fronts, and the evolving ice budget on the Antarctic continent. The broad trends of the Cenozoic climate curve for New Zealand deduced from fossil evidence in the uplifted marine sedimentary record correspond well to the principal paleoceanographic events controlling the evolution and migration of the oceanic fronts in the NZSSO.

text: History of oceanic front development in the New Zealand sector of the Southern Ocean during the Cenozoic--a synthesis The New Zealand sector of the Southern Ocean (NZSSO) has opened about the Indian-Pacific spreading ridge throughout the Cenozoic. Today the NZSSO is characterised by broad zonal belts of antarctic (cold), subantarctic (cool), and subtropical (warm) surface-water masses separated by prominent oceanic fronts: the Subtropical Front (STF) c. 43deg.S, Subantarctic Front (SAF) c. 50deg.S, and Antarctic Polar Front (AAPF) c. 60deg.S. Despite a meagre database, the broad pattern of Cenozoic evolution of these fronts is reviewed from the results of Deep Sea Drilling Project-based studies of sediment facies, microfossil assemblages and diversity, and stable isotope records, as well as from evidence in onland New Zealand Cenozoic sequences. Results are depicted schematically on seven paleogeographic maps covering the NZSSO at 10 m.y. intervals through the Cenozoic. 
During the Paleocene and most of the Eocene (65-35 Ma), the entire NZSSO was under the influence of warm to cool subtropical waters, with no detectable oceanic fronts. In the latest Eocene (c. 35 Ma), a proto-STF is shown separating subantarctic and subtropical waters offshore from Antarctica, near 65deg.S paleolatitude. During the earliest Oligocene, this front was displaced northwards by development of an AAPF following major global cooling and biotic turnover associated with ice sheet expansion to sea level on East Antarctica. Early Oligocene full opening (c. 31 Ma) of the Tasmanian gateway initiated vigorous proto-circum-Antarctic flow of cold/cool waters, possibly through a West Antarctic seaway linking the southern Pacific and Atlantic Oceans, including detached northwards "jetting" onto the New Zealand plateau where condensation and unconformity development was widespread in cool-water carbonate facies. Since this time, a broad tripartite division of antarctic, subantarctic, and subtropical waters has existed in the NZSSO, including possible development of a proto-SAF within the subantarctic belt. In the Early-early Middle Miocene (25-15 Ma), warm subtropical waters expanded southwards into the northern NZSSO, possibly associated with reduced ice volume on East Antarctica but particularly with restriction of the Indonesian gateway and redirection of intensified warm surface flows southwards into the Tasman Sea, as well as complete opening of the Drake gateway by 23 Ma allowing more complete decoupling of cool circum-Antarctic flow from the subtropical waters. During the late Middle-Late Miocene (15-5 Ma), both the STF and SAF proper were established in their present relative positions across and about the Campbell Plateau, respectively, accompanying renewed ice buildup on East Antarctica and formation of a permanent ice sheet on West Antarctica, as well as generally more expansive and intensified circum-Antarctic flow. 
The ultimate control on the history of oceanic front development in the NZSSO has been plate tectonics through its influence on the paleogeographic changes of the Australian-New Zealand-Antarctic continents and their intervening oceanic basins, the timing of opening and closing of critical seaways, the potential for submarine ridges and plateaus to exert some bathymetric control on the location of fronts, and the evolving ice budget on the Antarctic continent. The broad trends of the Cenozoic climate curve for New Zealand deduced from fossil evidence in the uplifted marine sedimentary record correspond well to the principal paleoceanographic events controlling the evolution and migration of the oceanic fronts in the NZSSO.

year: 2001-12-01

title: Korean migrants' experiences and attitudes towards mental illness and mental health services in New Zealand

authors: Oh, Leah Minkyung

subjects: Korean

abstract: The process of migration is known to cause significant psychological distress. Korean migrants living in New Zealand are the focus of this study as the term “Asian” has been identified as over-simplyfying the diversity that exists across Asian groups. Furthermore, research in other Western countries on Korean migrants show that they underutilise mental health services when compared to other Asian groups. Semi-structured interviews were conducted with ten members from the local Korean community which explored their experiences and attitudes towards mental illness and mental health services in New Zealand. Through thematic analysis common themes and patterned responses were identified. Some identified themes were: Cultural barriers, language barriers and lack of information on mental health and mental health services. The most influential factor was found to be Korean cultural values being in conflict with the general understanding of mental illness and mental health services in New Zealand. The implications of this research will be to assist Korean migrants to access mental health services in times of need.

text: Korean migrants' experiences and attitudes towards mental illness and mental health services in New Zealand The process of migration is known to cause significant psychological distress. Korean migrants living in New Zealand are the focus of this study as the term “Asian” has been identified as over-simplyfying the diversity that exists across Asian groups. Furthermore, research in other Western countries on Korean migrants show that they underutilise mental health services when compared to other Asian groups. Semi-structured interviews were conducted with ten members from the local Korean community which explored their experiences and attitudes towards mental illness and mental health services in New Zealand. Through thematic analysis common themes and patterned responses were identified. Some identified themes were: Cultural barriers, language barriers and lack of information on mental health and mental health services. The most influential factor was found to be Korean cultural values being in conflict with the general understanding of mental illness and mental health services in New Zealand. The implications of this research will be to assist Korean migrants to access mental health services in times of need.

year: 2014

title: Ka hao te rangatahi: Exploring school and work pathways for rangatahi Māori / Youth  growing up within gang space in Aotearoa

authors: Maihi, Bonnie

subjects: Rangatahi

abstract: This thesis explores the experiences of rangatahi Māori growing up in gang environments in Aotearoa, focusing on their educational and employment journeys. The research aims to elevate the rangatahi narratives without reducing them to mere statistics or stereotypes, highlighting their resilience and insights in contexts often characterized by stigma and judgement. Employing principles of Kaupapa Māori, Critical Pedagogy, and a Waka navigation framework, this study challenges deficit-based perspectives that typically dominate discussions about gangs. 

On a practical level, it advocates for trust-based partnerships with gang whānau, emphasizing the importance of honesty and respect to foster collaboration. Existing Whānau -led initiatives illustrate the possibilities of merging cultural knowledge with everyday survival, showcasing resilience as a lived reality. Theoretically, the research offers an insider perspective, positioning myself as researcher to honor lived experiences and mitigate traditional negative framings of gang spaces, instead framing them as complex sites of identity and resilience. 

Ultimately, this thesis posits that rangatahi Māori in gang settings are not merely problems to be solved but are agents of hope and strength, rooted in their heritage. Their futures should be shaped by their identities rather than deficits, affirming their tino rangatiratanga and capacities for meaningful contributions within their communities.

text: Ka hao te rangatahi: Exploring school and work pathways for rangatahi Māori / Youth  growing up within gang space in Aotearoa This thesis explores the experiences of rangatahi Māori growing up in gang environments in Aotearoa, focusing on their educational and employment journeys. The research aims to elevate the rangatahi narratives without reducing them to mere statistics or stereotypes, highlighting their resilience and insights in contexts often characterized by stigma and judgement. Employing principles of Kaupapa Māori, Critical Pedagogy, and a Waka navigation framework, this study challenges deficit-based perspectives that typically dominate discussions about gangs. 

On a practical level, it advocates for trust-based partnerships with gang whānau, emphasizing the importance of honesty and respect to foster collaboration. Existing Whānau -led initiatives illustrate the possibilities of merging cultural knowledge with everyday survival, showcasing resilience as a lived reality. Theoretically, the research offers an insider perspective, positioning myself as researcher to honor lived experiences and mitigate traditional negative framings of gang spaces, instead framing them as complex sites of identity and resilience. 

Ultimately, this thesis posits that rangatahi Māori in gang settings are not merely problems to be solved but are agents of hope and strength, rooted in their heritage. Their futures should be shaped by their identities rather than deficits, affirming their tino rangatiratanga and capacities for meaningful contributions within their communities.

year: 2025