Thesis (Ph. D.)--University of Toronto, 2005. / Includes bibliographical references (leaves 339-365).

The paleomagnetic history of the volcanic rocks of Easter Island was investigated using standard paleomagnetic techniques. The remanent magnetization of 673 specimens from the three volcanic episodes recognized on the island were measured using a spinner magnetometer. Inclinations, declinations and virtual geomagnetic poles were calculated for each flow. The majority of the samples were collected from the youngest episode, the Terevaka volcanics, which represents activity from the last 200, 000 years. The 65 flows from the Terevaka episode were used to study the Brunhes epoch on Easter Island. A mean geomagnetic pole was located at 87.4°N latitude and 204.2°E longitude. With its oval of 95% confidence, this includes the present geographic pole, as expected for such young rocks. Secular variation, expressed by the angular deviation of the mean virtual geomagnetic pole, was obtained for the Terevaka samples, This value, 12.8° with 95% confidence limits of 14.9° and 11.2°, is compared to other values for Brunhes age rocks. It appears to fit well onto a calculated model for the variation of angular dispersion with site latitude. It also can be related to an anomalously low region of secular variation found in the central Pacific. / Graduation date: 1974

No description available.

The mystery of the trees of Rapa Nui (Easter Island) is a complex problem within a dynamic ecosystem. With new physical cores from the volcanic crater lake Rano Kao, this dissertation uncovers a detailed 15,000 year ecological history of Easter Island and its climatic variability. New radiocarbon dating methods establish a more precise chronology which shows that the island before human habitation was very different than what we know today. It had a simple but prolific ecology that transitioned into a barren grassland. What factors caused the transition are unclear but are likely to be human related. As the forests slowly disappeared, it could have triggered changes in regional and local climate, particularly rainfall, which generally leads to a rapid loss of ecosystems. With virtually stable climate conditions over the last 2,000 years, Easter Island has lost 33 species of plants including the giant palms, and still has not recovered today. This research challenges the previously accepted theory that humans deforested the island for the sole purpose of moving the Moai around, and focuses rather on uncovering the role of climate change that may have altered the ecosystem. New cores were obtained in 2005 from Rano Kao that were radiocarbon dated using scirpus seeds. The nine meters of core were sampled for oxygen isotope analysis of the lake water changes, a new science to the island. Detailed palynological studies of pollen and non-pollen palynomorphs uncovered changing vegetation patterns that aligned with a 700 year drought cycle. Conclusions support a cool-dry event that occurred 545 years ago, at which time the giant palms disappeared. While it was not the focus of this study, evidence confirms human occupation for more than 500 years before the disappearance of the trees.

No description available.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1969. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

This thesis contains my writings and concept development, as it relates to personal history, time and animated art. This is explored through various methodologies, including short story and Zen meditative writing. As a companion to my recent thesis exhibition, this paper looks to make logical, emotional and spiritual connections between my art practice, ritualized cultural tropes and contemporary views of mortality.

Rapa Nui (Easter Island) has for centuries been known as an isolated island of archaeological mysteries; yet after a rapid modernisation this is today an international tourist destination, a World Heritage Site and a glocalised community. This anthropological study based on long-term fieldwork among young Rapa Nui on the island and away, describes how it can be to grow up in and to belong to such a place. Place is seen as a continually constructed social space and is influenced by Miriam Kahn??s use of Henri Lefebvre??s concept thirdspace. Rapa Nui, as a place, people and community, is here understood as continuously formed by global and local influences. Thus, although historical, global and national influences can seem overwhelming in such a small tourist destination with a turbulent colonial history, this study also sees the opinions and practices of the inhabitants as important agents. This thesis shows how young Rapa Nui are both influenced by and influencing what Rapa Nui is and becomes. Above all, their guiding principle seems to be a continuing strong attachment to their land ??also called Te Pito o te Henua (??The Navel of the World??).

Rapa Nui (Easter Island) has for centuries been known as an isolated island of archaeological mysteries; yet after a rapid modernisation this is today an international tourist destination, a World Heritage Site and a glocalised community. This anthropological study based on long-term fieldwork among young Rapa Nui on the island and away, describes how it can be to grow up in and to belong to such a place. Place is seen as a continually constructed social space and is influenced by Miriam Kahn??s use of Henri Lefebvre??s concept thirdspace. Rapa Nui, as a place, people and community, is here understood as continuously formed by global and local influences. Thus, although historical, global and national influences can seem overwhelming in such a small tourist destination with a turbulent colonial history, this study also sees the opinions and practices of the inhabitants as important agents. This thesis shows how young Rapa Nui are both influenced by and influencing what Rapa Nui is and becomes. Above all, their guiding principle seems to be a continuing strong attachment to their land ??also called Te Pito o te Henua (??The Navel of the World??).

No / Recognizable throughout the world, the stone statues (moai) of Rapa Nui (Easter Island) represent the largest monolithic architecture produced in Polynesia. The exquisitely carved and finished head and torso of each statue testifies to a skill in stone carving and dressing unmatched throughout the Pacific. Yet, approximately one thousand ‘classic’ statues were produced at the quarries within a few hundred years. What was the ritual status of the quarry and the labour necessary to produce the numbers of statues that allowed Heyerdahl to declare that the ‘whole mountain massif has been reshaped, the volcano has been greedily cut up’ (1958: 83)? What was it like to go to work at Rano Raraku? By drawing on a range of evidence we argue that walking to and labouring at Rano Raraku represented a spatial and temporal journey to a place of highly dangerous forces, a cosmogonic centre where prehistoric Rapa Nui people came face to face with their ancestors and the Polynesian gods.