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The presence of eucalyptol in Artemisia australis validates its use in traditional hawaiian medicine

Asian Pacific Journal of Tropical Biomedicine 2014年第7期4卷 520-522页

作者： David Zant Daniel A.Gubler Department of Biochemistry and Physical Sciences Brigham Young University-Hawaii

Objective:To identify the major organic compounds of Artemisia austeralis(***),a plant used in traditional hawaiian medicine for the treatment of ***:The dichloromethane extract of *** was analyzed by gas chromatography—mass spectroscopy and major compounds were identified by a National Institute of Standards and Technology library search and confirmed by peak enhancement Results:The major chemical components of *** include ***,and ***:The presence and biological activity of eucalyptol correlate very well with the usage of this plant in traditional hawaiian medicine.

关键词： Artemisia australis Eucalyptol Borneol Traditional hawaiian medicine Asthma hawaiian endemic plants

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High-Pressure Melting Experiments on Basalt-Peridotite Layered Source (KLB-1/N-MORB): Implications for Magma Genesis in Hawaii

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International Journal of Geosciences 2017年第1期8卷 1-15页

作者： Shan Gao Eiichi Takahashi Toshihiro Suzuki Magma Factory Earth and Planetary Science Department Tokyo Institute of Technology Tokyo Japan Guangzhou Institute of Geochemistry Chinese Academy of Science Guangzhou China

In order to understand the melting processes that occur within recycled oceanic crust and mantle in a heterogeneous plume (e.g., that beneath the hawaiian Islands), a series of high-pressure-high-temperature layered experiments were performed at 2.9 GPa, 5 GPa, and 8 GPa, from 1300°C to 1650°C, using a fertile peridotite KLB-1 and N-MORB. Our experiments at conditions below the dry peridotite solidus produced melt compositions that ranged from basaltic andesite to tholeiite. An Opx reaction band formed between eclogite and peridotite layers, likely via chemical reaction between a silica-rich eclogite-derived partial melt and olivine in the peridotite matrix. At temperatures at or above the dry peridotite solidus, substantial melting occurred in both basalt and peridotite layers, and fully molten basalt melt and melt pockets from the peridotite layer combined. In our layered experiments, major and minor element contents in reacted melts closely matched those of hawaiian tholeiite and picrite, except for Fe. Partial melts of anhydrous run products had ~55 - 57 wt% SiO2 at low temperature (i.e., were andesitic) and had ~50 - 53 wt% SiO2 at high temperatures, slightly below the dry peridotite solidus (i.e., were tholeiitic, and similar to those that occur during the Hawaii shield-building stage). Based on the Fe- and LREE-enriched signature in hawaiian tholeiites, we propose that recycled components in the hawaiian plume are not modern N-MORB, but are Fe-rich tholeiite;a lithology that was common in the Archaean and early Proterozoic. We have demonstrated that the entire compositional spectrum of hawaiian tholeiites (basalt to picrite) can be formed by basalt-peridotite reactive melting near the dry solidus of peridotite. Based on these results, we propose that the potential temperature of the sub-hawaiian plume may be much lower than previously estimated.

关键词： hawaiian Tholeiite Recycled Oceanic Crust High Pressure Layered Experiments N-MORB Major Elements

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